Velium Hunter Summoned Me
 

I've killed maybe 6 of these before while camping Brood mother. I hadn't been summoned by them once. Must have gotten a high level one, it summoned me repeatedly and killed me. Wiki doesn't have summoning as a special ability. I guess I need to stay out of LOS?

I also haven't gotten a brood mother pop so i guess it's good practice

Unfortunately, line of sight won't protect you from being summoned.
Yes, you must have gotten a higher-level one. NPCs level 50 and up generally summon (it's kind of exceptional when they don't).
What class are you?

Enchanter. Lvl 60 undinged to 59. Didn’t have too much Trouble soloing the camp at 59 but I never got a named pop and apparently I never fought a velium hunter this high either

I had a charmed pet on the mob but I slowed him twice and kept chain rooting him and refreshing my root. Maybe I got aggro that way

Could be; root is significant aggro since the December 2022 patch.

Velium Hunters always summon

In between summons you can toss a blur on the mob and get agro back on your pet. If your getting lots of slow resists you will be very high agro

Wasn’t it classic for NPCs to ignore pets when choosing what to summon?

Death touch for sure. I don't know about summoning. I vaguely recall people posting logs of "LOL he was mad and summoned my pet", but may be a bad memory

Is blanket of forgetfulness the best spell in this situation? I’ve been using it for the consistent mem blurs it gives me