Toxic Atronochs

Toxic Atronochs are Elemental Daedra of Acid and Poison, immune to their damage types and adding those types to their attacks.
When killed, they explode in a 20ft radius dealing 4d6 acid and poison damage, making anything within the range to do a dex save.
They exist near bogs, swamps, and highly arcane areas.
They know all types of acid and poison spells, higher tier Toxic Atronochs can heal from those damage types.