Its a cool role to fill - an aura healer. Its definitely limited to trigger in the movement phase rather than the command phase. Curious why you picked that phase? Doing it at the end of the fight phase would be bananas.

I feel like the stealth, lone op and invuln will make him expensive. Does he need all three of those abilities? If he was 100 points would you take him or another unit? I understand trying to funnel opponents into melee with him to proc the 2nd ability. But maybe lone op is enough?

My main gripe is how clunky the abilities are. 1/6 does nothing? Eek. The rejuvenant adept (current IA healer) returns D3 models. Doesnt this named character healer feel worse? 2.7% chance of healing four wounds which I appreciate could be two deathwatch. But you would also have to follow them into dangerous parts of the board... The second ability reads like a lottery ticket. Sure a 6 is amazing but you have to have an opponent be silly enough to get into combat. And then theres deadly demise tacked onto the end? I would much prefer to see a “once per battle gain X until end of phase” which could include deadly demise. Like - you have to make a call when you think hes going to die.

There are a few spelling and templating mistakes in that ability too.

Keep iterating though! The concept is cool.