I don't think you should have the upgraded Death ability as "Deadly Poison"; players will get horribily confused. I never knew it only does 2 damage instead of the orginal 3. I think the unupped version can be called "Weak Poison" and the upgraded verison can be called "Poison".
Also, I think Devour for both versions can be lowered to 1
, because this creature merely has 3 health, and it requires a duo in order to make use of its ability.