Corrupted versions of summons...
exactly summon wolfs and summon undead
Doesn't depend of time extending... nor time reduce.
So
If someone with necromancy focus
Doing [summon wolfs/undead]>[Reduce time]×4
Then summons dying instantly and turning into corrupted rage versions...
More over
That thing abuse summon delay debuff by completely removing it.

P.S.
Summon vex and summon steed
Works... almost well.
I will check summon vex later; but it probably fine.
And yes, there's everything fine with steed...
(Except that part where player can scroll teleport themselves by scroll teleporting steed em running on; but it's kind of ars nouveau bag and too genius trick to fix it)

The Reduce Time exploit is the culprit in the first place. The focus can't know if the summon expired in a legit way or from an abuse. Needs to be fixed upstream on ars, to avoid that summoning with reduce time bypass applying the sickness.

In the meanwhile, you can locally block the bug by adding in the config of the two glyphs
augment_limits = ["ars_nouveau:glyph_duration_down=1"] (unless you boosted the base duration, or reduced the extend/reduce time duration)

Oh,
I forgot about configs.
That should help at least somehow...

Thanks.

For 1.19 a fix was pushed to ars, should be included in latest. By not summoning them at all (when the duration is <= 0 ) the focus effect shouldn't go crazy, and the infinity vex bug shouldn't happen either.

For 1.18 and 1.16, i really doubt the fix will be backported