I've tried a bunch of different combinations trying to replicate this thing, but I can't seem to find it. It must be a very specific interaction you've found.
- Would you mind sending me a screenshot of the crash if you have one?
- If not, don't worry, but do you remember the buffs you had that you automatically give the summon?
- Were the damage particles the same generic damage particles that play when something gets hit/takes damage?
- Did the game crash when either unit tried to summon a guardian with no buffs?
- If not, it was probably a weird interaction with another daemon. Can you think of anything that has to do with healing/summoning/killing/auras on another unit?