Venomancer

Prerequisite: The ability to cast at least one spell

When you gain this feat, you gain the following benefits:

• The poison damage you deal with spells ignores poison resistance but not immunity.  Additionally, creatures that normally have advantage on saving throws against the poisoned condition, do not have advantage if the source of the condition is a spell that you cast.
• Once per turn, when you deal damage to one or more creatures that are poisoned, with a spell of 1st level or higher, you regain hit points equal to the level of the spell.