Collection<Npc> newNpcs = watchedNpcs.getNewEntities();
Collection<Npc> knownNpcs = watchedNpcs.getKnownEntities();
RSCPacketBuilder packet = new RSCPacketBuilder();
packet.setID(77);
packet.addBits(knownNpcs.size(), 8);
for (Npc n : knownNpcs) {
packet.addBits(n.getIndex(), 16);
if (watchedNpcs.isRemoving(n)) {
packet.addBits(1, 1);
packet.addBits(1, 1);