Essence

Every creature has 6 points of Essence. Essence
can be lost through Essence drain {x} where {x} is
the number of Essence points lost.

When a creature has 0 or less Essence points it gets
destroyed and a neutral 4/4 Cyberzombie token
gets created.

Creatures destroyed by Essence drain can't be regenerated and their equipment is put into the graveyard.