Blood bond is an effect only available as part of a bless. It causes any damage taken by a unit to be shared equally amongst all units within a 5 square radius.
Whilst this is a powerful effect for distributing damage amongst units, it does have a number of weaknesses. Notably, the damage recieved through blood bond bypasses all resistances and can quickly stack up damage on an otherwise resilient unit such as an immobile pretender. Additionally, very high damage attacks such asbecome significantly more damaging against several blood bonded units.