Fiendling

At a glance:
Infernal lineage, elemental infusion, horns and tails.

Speed: 30ft.
Size: Medium
Ether Method: Reservoir
Darkvision: Yes

Special Feature: Elementally Imbued

Choose one elemental damage type (Burning, Freezing, Shocking, Acidic).

Whenever you would take damage of the chosen type, reduce it by your Character Level.
Casting spells tagged with the chosen type cost -3 Mana (minimum 1).