Exertion has been replaced by Killer Instinct.

how come I'm not getting dazed after adrenaline rush? My berserker doesnt have the anti-daze mutation

Please, study the changes to classes in TFTV: http://wiki.phoenixpoint.com/Terror_from_the_Void#Classes
The use of Adrenaline Rush doesn’t daze anymore but the downside is now: Until EoT one-handed weapon and all non-weapon, non-movement skills cost 1AP. Cannot use recover.

Wiki still lists Exertion and doesnt say anything about the daze change. Not sure why anyone would think you could or would use recover on the same turn he uses adrenaline rush.. Recover needs all 4 AP, if you're using AD you're attacking that turn not using 4 AP to recover

OK. The Adrenaline Rush description indeed still mentions Exertion “Exertion or Aspida “Stim Spray” abilities basically double efficiency when combined with Adrenaline.“ But this is an oversight.
Exertion was Berserker’s lvl. 5 class perk. In Update #29 (26.06.2023) Killer Instinct replaced Exertion.
Recover for 1 AP would be OP.
Vanila’s description:
All abilities cost a maximum of 1 Action Point until the end of the turn. Next turn, you will be dazed.
Will Points abilities cannot be used until the end of your turn. Accuracy reduced by 50%
TFTV’s description:
Until EoT one-handed weapon and all non-weapon, non-movement skills cost 1AP. Cannot use recover.
For me it’s pretty clear.

Eh. Exerttion was Berserker's lvl. 6 class perk.