Originally Posted by
Priestlyone
I haven't done any in-depth looking into the subject, so feel free to take my opinions with a pinch of salt.
I'd say still pre-pot. The main reason for this is, the biggest part of your DPS comes from when all drakes are down and halfus has a 400% damage taken buff - if you look at your DPS just after drakes dies, and then again when Halfus goes down - you'll see it's higher at the end. Also, bear in mind that you do still get some use out of volcanic potion even if only half of it is available when hero/drakes are up.