Non-Battleship Corsair?

Alright, thanks for the replies. I'll get Cannon first for sure, and I'll decide whether I want Torpedo or Elemental Boost after.

The problem I have with EB, aside from it being slightly weaker than Torpedo, is that you'll take quite a lot of damage mobbing with it. Whenever you cast Flamethrower it will unfreeze any monsters that were frozen from the previous Ice Splitter. Needless to say, you'll get hit almost the entire time you're mobbing in this fashion.

Also, since I train at Oblivion 2, it wouldn't work for me at all. Monsters throughout the top two tiers of the Time Temple are strong to Ice or Fire, so mobbing like that would suck.