diff --git a/consensus/consensus_service.go b/consensus/consensus_service.go
index 278e4aea8..d206aa876 100644
--- a/consensus/consensus_service.go
+++ b/consensus/consensus_service.go
@@ -457,10 +457,13 @@ func (consensus *Consensus) UpdateConsensusInformation() Mode {
 	hasError := false
 	header := consensus.ChainReader.CurrentHeader()
 	epoch := header.Epoch()
-	curPubKeys := committee.WithStakingEnabled.ComputePublicKeys(
-		epoch, consensus.ChainReader,
-	)[int(header.ShardID())]
-
+	if consensus.Decider.Policy() != quorum.SuperMajorityStake &&
+		consensus.ChainReader.Config().IsStaking(epoch) {
+		consensus.Decider = quorum.NewDecider(quorum.SuperMajorityStake)
+	}
+	_, curPubKeys := committee.WithStakingEnabled.ComputePublicKeys(
+		epoch, consensus.ChainReader, int(header.ShardID()),
+	)
 	consensus.numPrevPubKeys = len(curPubKeys)
 	consensus.getLogger().Info().Msg("[UpdateConsensusInformation] Updating.....")
 	if shard.Schedule.IsLastBlock(header.Number().Uint64()) {
@@ -468,9 +471,11 @@ func (consensus *Consensus) UpdateConsensusInformation() Mode {
 		consensus.SetEpochNum(epoch.Uint64() + 1)
 		consensus.getLogger().Info().Uint64("headerNum", header.Number().Uint64()).
 			Msg("[UpdateConsensusInformation] Epoch updated for next epoch")
-		pubKeys = committee.WithStakingEnabled.ComputePublicKeys(
-			new(big.Int).Add(epoch, common.Big1), consensus.ChainReader,
-		)[int(header.ShardID())]
+		_, pubKeys = committee.WithStakingEnabled.ComputePublicKeys(
+			new(big.Int).Add(epoch, common.Big1),
+			consensus.ChainReader,
+			int(header.ShardID()),
+		)
 	} else {
 		consensus.SetEpochNum(epoch.Uint64())
 		pubKeys = curPubKeys
diff --git a/consensus/quorum/one-node-one-vote.go b/consensus/quorum/one-node-one-vote.go
index 8595a9c31..e1ca4bbbc 100644
--- a/consensus/quorum/one-node-one-vote.go
+++ b/consensus/quorum/one-node-one-vote.go
@@ -6,12 +6,13 @@ import (
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/harmony-one/bls/ffi/go/bls"
 	"github.com/harmony-one/harmony/internal/utils"
+	"github.com/harmony-one/harmony/shard"
 	// "github.com/harmony-one/harmony/staking/effective"
 )
 
 type uniformVoteWeight struct {
-	SignatureReader
 	DependencyInjectionWriter
+	SignatureReader
 }
 
 // Policy ..
@@ -71,3 +72,9 @@ func (v *uniformVoteWeight) Award(
 
 	return payout
 }
+
+func (v *uniformVoteWeight) ShouldSlash(k shard.BlsPublicKey) bool {
+	// No-op, no semantic meaning in one-slot-one-vote
+	// fmt.Println("Called here for key:", k.Hex())
+	return false
+}
diff --git a/consensus/quorum/one-node-staked-vote.go b/consensus/quorum/one-node-staked-vote.go
index efd2b385b..1d6eb9020 100644
--- a/consensus/quorum/one-node-staked-vote.go
+++ b/consensus/quorum/one-node-staked-vote.go
@@ -7,6 +7,7 @@ import (
 	"github.com/harmony-one/bls/ffi/go/bls"
 	"github.com/harmony-one/harmony/numeric"
 	"github.com/harmony-one/harmony/shard"
+	"github.com/harmony-one/harmony/staking/slash"
 )
 
 var (
@@ -21,6 +22,8 @@ type stakedVoter struct {
 type stakedVoteWeight struct {
 	SignatureReader
 	DependencyInjectionWriter
+	DependencyInjectionReader
+	slash.ThresholdDecider
 	// EPOS based staking
 	validatorStakes            map[[shard.PublicKeySizeInBytes]byte]stakedVoter
 	totalEffectiveStakedAmount *big.Int
@@ -73,3 +76,13 @@ func (v *stakedVoteWeight) ToggleActive(*bls.PublicKey) bool {
 	// TODO Implement
 	return true
 }
+
+func (v *stakedVoteWeight) ShouldSlash(key shard.BlsPublicKey) bool {
+	s, _ := v.ShardIDProvider()()
+	switch s {
+	case shard.BeaconChainShardID:
+		return v.SlashThresholdMet(key)
+	default:
+		return false
+	}
+}
diff --git a/consensus/quorum/quorum.go b/consensus/quorum/quorum.go
index 03a86acd0..34ac736c7 100644
--- a/consensus/quorum/quorum.go
+++ b/consensus/quorum/quorum.go
@@ -6,6 +6,7 @@ import (
 
 	"github.com/harmony-one/bls/ffi/go/bls"
 	"github.com/harmony-one/harmony/shard"
+	"github.com/harmony-one/harmony/staking/slash"
 	// "github.com/harmony-one/harmony/staking/effective"
 )
 
@@ -75,10 +76,16 @@ type DependencyInjectionWriter interface {
 	SetShardIDProvider(func() (uint32, error))
 }
 
+// DependencyInjectionReader ..
+type DependencyInjectionReader interface {
+	ShardIDProvider() func() (uint32, error)
+}
+
 // Decider ..
 type Decider interface {
 	SignatureReader
 	DependencyInjectionWriter
+	slash.Slasher
 	ToggleActive(*bls.PublicKey) bool
 	// UpdateVotingPower(keeper effective.StakeKeeper)
 	Policy() Policy
@@ -96,17 +103,14 @@ type cIdentities struct {
 	commit     map[string]*bls.Sign
 	// viewIDSigs: every validator
 	// sign on |viewID|blockHash| in view changing message
-	viewID map[string]*bls.Sign
+	viewID      map[string]*bls.Sign
+	seenCounter map[[shard.PublicKeySizeInBytes]byte]int
 }
 
 type depInject struct {
 	shardIDProvider func() (uint32, error)
 }
 
-func (d *depInject) SetShardIDProvider(p func() (uint32, error)) {
-	d.shardIDProvider = p
-}
-
 func (s *cIdentities) IndexOf(pubKey *bls.PublicKey) int {
 	idx := -1
 	for k, v := range s.publicKeys {
@@ -132,9 +136,23 @@ func (s *cIdentities) Participants() []*bls.PublicKey {
 }
 
 func (s *cIdentities) UpdateParticipants(pubKeys []*bls.PublicKey) {
+	// TODO - might need to put this in separate method
+	s.seenCounter = make(map[[shard.PublicKeySizeInBytes]byte]int, len(pubKeys))
+	for i := range pubKeys {
+		k := shard.BlsPublicKey{}
+		k.FromLibBLSPublicKey(pubKeys[i])
+		s.seenCounter[k] = 0
+	}
 	s.publicKeys = append(pubKeys[:0:0], pubKeys...)
 }
 
+func (s *cIdentities) SlashThresholdMet(key shard.BlsPublicKey) bool {
+	s.seenCounter[key]++
+	fmt.Println("Slash Map", s.seenCounter)
+	return s.seenCounter[key] == slash.UnavailabilityInConsecutiveBlockSigning
+
+}
+
 func (s *cIdentities) DumpParticipants() []string {
 	keys := make([]string, len(s.publicKeys))
 	for i := 0; i < len(s.publicKeys); i++ {
@@ -174,8 +192,8 @@ func (s *cIdentities) AddSignature(p Phase, PubKey *bls.PublicKey, sig *bls.Sign
 }
 
 func (s *cIdentities) Reset(ps []Phase) {
-	for _, p := range ps {
-		switch m := map[string]*bls.Sign{}; p {
+	for i := range ps {
+		switch m := map[string]*bls.Sign{}; ps[i] {
 		case Prepare:
 			s.prepare = m
 		case Commit:
@@ -223,43 +241,45 @@ func (s *cIdentities) ReadAllSignatures(p Phase) []*bls.Sign {
 	return sigs
 }
 
-func newMapBackedSignatureReader() cIdentities {
-	return cIdentities{
+func newMapBackedSignatureReader() *cIdentities {
+	return &cIdentities{
 		[]*bls.PublicKey{}, map[string]*bls.Sign{},
 		map[string]*bls.Sign{}, map[string]*bls.Sign{},
+		map[[shard.PublicKeySizeInBytes]byte]int{},
 	}
 }
 
-func (c *composite) ShouldSlash(shard.BlsPublicKey) bool {
-	s, _ := c.shardIDProvider()
-	switch s {
-	case shard.BeaconChainShardID:
-		return true
-	default:
-		return false
-	}
+type composite struct {
+	DependencyInjectionWriter
+	SignatureReader
 }
 
-type composite struct {
-	cIdentities
-	depInject
+func (d *depInject) SetShardIDProvider(p func() (uint32, error)) {
+	d.shardIDProvider = p
+}
+
+func (d *depInject) ShardIDProvider() func() (uint32, error) {
+	return d.shardIDProvider
 }
 
 // NewDecider ..
 func NewDecider(p Policy) Decider {
 	signatureStore := newMapBackedSignatureReader()
-	dependencies := depInject{}
-	c := &composite{signatureStore, dependencies}
+	deps := &depInject{}
+	c := &composite{deps, signatureStore}
 	switch p {
 	case SuperMajorityVote:
-		return &uniformVoteWeight{&c.cIdentities, &c.depInject}
+		return &uniformVoteWeight{c.DependencyInjectionWriter, c}
 	case SuperMajorityStake:
+		fmt.Println("HRS")
 		return &stakedVoteWeight{
-			&c.cIdentities, &c.depInject,
+			c.SignatureReader,
+			c.DependencyInjectionWriter,
+			c.DependencyInjectionWriter.(DependencyInjectionReader),
+			c.SignatureReader.(slash.ThresholdDecider),
 			map[[shard.PublicKeySizeInBytes]byte]stakedVoter{},
 			big.NewInt(0),
 		}
-
 	default:
 		// Should not be possible
 		return nil
diff --git a/internal/chain/engine.go b/internal/chain/engine.go
index 0a1df170e..75ec56964 100644
--- a/internal/chain/engine.go
+++ b/internal/chain/engine.go
@@ -177,12 +177,16 @@ func (e *engineImpl) VerifySeal(chain engine.ChainReader, header *block.Header)
 // Finalize implements Engine, accumulating the block rewards,
 // setting the final state and assembling the block.
 func (e *engineImpl) Finalize(
-	chain engine.ChainReader, header *block.Header, state *state.DB, txs []*types.Transaction,
+	chain engine.ChainReader, header *block.Header,
+	state *state.DB, txs []*types.Transaction,
 	receipts []*types.Receipt, outcxs []*types.CXReceipt,
-	incxs []*types.CXReceiptsProof, stks []*staking.StakingTransaction) (*types.Block, error) {
+	incxs []*types.CXReceiptsProof, stks []*staking.StakingTransaction,
+) (*types.Block, error) {
 	// Accumulate any block and uncle rewards and commit the final state root
 	// Header seems complete, assemble into a block and return
-	if err := AccumulateRewards(chain, state, header, e.Rewarder(), e.Slasher()); err != nil {
+	if err := AccumulateRewards(
+		chain, state, header, e.Rewarder(), e.Slasher(),
+	); err != nil {
 		return nil, ctxerror.New("cannot pay block reward").WithCause(err)
 	}
 
@@ -221,7 +225,9 @@ func (e *engineImpl) Finalize(
 }
 
 // QuorumForBlock returns the quorum for the given block header.
-func QuorumForBlock(chain engine.ChainReader, h *block.Header, reCalculate bool) (quorum int, err error) {
+func QuorumForBlock(
+	chain engine.ChainReader, h *block.Header, reCalculate bool,
+) (quorum int, err error) {
 	var ss shard.State
 	if reCalculate {
 		ss, _ = committee.WithStakingEnabled.Compute(h.Epoch(), *chain.Config(), nil)
diff --git a/internal/chain/reward.go b/internal/chain/reward.go
index 37523a723..9b56d4260 100644
--- a/internal/chain/reward.go
+++ b/internal/chain/reward.go
@@ -2,6 +2,7 @@ package chain
 
 import (
 	"math/big"
+	"sync"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/harmony-one/bls/ffi/go/bls"
@@ -14,6 +15,7 @@ import (
 	common2 "github.com/harmony-one/harmony/internal/common"
 	"github.com/harmony-one/harmony/internal/ctxerror"
 	"github.com/harmony-one/harmony/internal/utils"
+	"github.com/harmony-one/harmony/shard"
 	"github.com/harmony-one/harmony/staking/slash"
 	"github.com/pkg/errors"
 )
@@ -82,29 +84,54 @@ func AccumulateRewards(
 	}
 
 	accounts := []common.Address{}
+	missing := shard.NodeIDList{}
 
 	for idx, member := range parentCommittee.NodeList {
-		if signed, err := mask.IndexEnabled(idx); err != nil {
+		switch signed, err := mask.IndexEnabled(idx); true {
+		case err != nil:
 			return ctxerror.New("cannot check for committer bit",
 				"committerIndex", idx,
 			).WithCause(err)
-		} else if signed {
+		case signed:
 			accounts = append(accounts, member.EcdsaAddress)
+		default:
+			missing = append(missing, member)
 		}
 	}
 
-	type t struct {
+	// do it quickly
+	w := sync.WaitGroup{}
+	for i := range missing {
+		w.Add(1)
+		go func(member int) {
+			defer w.Add(-1)
+			// Slash if missing block was long enough
+			if slasher.ShouldSlash(missing[member].BlsPublicKey) {
+				// TODO Logic
+			}
+		}(i)
+	}
+
+	w.Wait()
+
+	payable := []struct {
+		string
 		common.Address
 		*big.Int
-	}
-	signers := []string{}
-	payable := []t{}
+	}{}
 
 	totalAmount := rewarder.Award(
 		BlockReward, accounts, func(receipient common.Address, amount *big.Int) {
-			signers = append(signers, common2.MustAddressToBech32(receipient))
-			payable = append(payable, t{receipient, amount})
-		})
+			payable = append(payable, struct {
+				string
+				common.Address
+				*big.Int
+			}{
+				common2.MustAddressToBech32(receipient), receipient, amount,
+			},
+			)
+		},
+	)
 
 	if totalAmount.Cmp(BlockReward) != 0 {
 		utils.Logger().Error().
@@ -114,7 +141,10 @@ func AccumulateRewards(
 		return errors.Wrapf(errPayoutNotEqualBlockReward, "payout "+totalAmount.String())
 	}
 
+	signers := make([]string, len(payable))
+
 	for i := range payable {
+		signers[i] = payable[i].string
 		state.AddBalance(payable[i].Address, payable[i].Int)
 	}
 
diff --git a/staking/slash/slasher.go b/staking/slash/slasher.go
index 2d6da48e2..c6e1e4047 100644
--- a/staking/slash/slasher.go
+++ b/staking/slash/slasher.go
@@ -2,7 +2,18 @@ package slash
 
 import "github.com/harmony-one/harmony/shard"
 
+const (
+	// UnavailabilityInConsecutiveBlockSigning is how many blocks in a row
+	// before "slashing by unavailability" occurs
+	UnavailabilityInConsecutiveBlockSigning = 1380
+)
+
 // Slasher ..
 type Slasher interface {
 	ShouldSlash(shard.BlsPublicKey) bool
 }
+
+// ThresholdDecider ..
+type ThresholdDecider interface {
+	SlashThresholdMet(shard.BlsPublicKey) bool
+}