Living Swarm. An unceasing mound of roiling flesh and bone, it always takes half damage from single target spells and attacks. this creature may be targeted multiple times by spells and abilities that require different creatures to be chosen.   Synaptic Link. While this creature is within 150ft of another creature with the Synapse ability it is immune to all Fear and Charm effects.   Ravenous. While this creature has more than half of its maximum hit points left, all melee attacks it makes are at advantage.