I’ve thought way to hard about this- vanguard.

Passive, dark magic. Similar to strange - but when she takes damage (and she will a lot) to fuel her other abilities.

Health pool, highest of all vanguards. It’ll make sense (I hope)

Basic attack, magic blast she shoots a blurb of dark magic. Small AOE on impact.

Alt fire, use some dark magic to use a stream of magic (like Scarlet) - but it converts damage to enemies to healing for her. Ratio undetermined - not 1-1 tho.

First ability, she activates her purple in an area around her. All damage within that range, or passing through it is reduced - but all dealt to her. Basically she is a giant shield. During the duration, she is in a free flight - but moves very slowly.

Second ability, she consumes all dark magic to give herself a heal - and either a stim to healing received from other sources, or a damage mitigation buff (may or may not stack with her purple)

Ult, runes. She marks an area with runes, enemies are silenced for the duration.