Quote Originally Posted by Letts View Post
3x mostly. First purification I use after the second wave (would be around 700tp after using RB), it would be back up in the middle of wave 5 with both widows up, then at the start of wave 8 around the time when you kill 2 jagd dolls and the next adds spawn and get grouped together. In wave 9 it will be back up around the middle of it but I manage to finish the fight without it at that stage.
I'm at 4 Purifications:

Wave 1 (Preloaded 5x Meds)
Wave 2 (Invigorate)
Wave 3 (Purification)
Wave 4 (Med 2x)
Wave 5 (Invigorate near start of Gobwidow HP, weave Meds 3x during Gobwidow, then Purification after cooldown ends)
Wave 6 (Invigorate as doll dies, then weave 5x Meds during last 20% of Gobwidow)
Wave 7 (Purification just as dolls spawn)
Wave 8 (Invigorate, then weave 5x Meds while finishing off last 20% of doll)
Wave 9 (Purification)

1574 on our first clear, but I haven't measured again.