Can't remember if I already asked, but will you be able to have multiple potions active at once?
Yes. Some potions have long lasting effects, so only a couple of battles... you can have unlimited different buffs active at the same time.
Anyway, I'm testing my game engine to see how it behaves in big battles:

Two players, 15 enemies and it works as smooth as with an empty screen. The game will run on a 10-year-old Core2Duo CPU with integrated Intel graphics card at 60fps with smaller resolutions like 1366x768. For HD screens it pushes about 53 fps on that config, but if you have just a little bit stronger CPU or dedicated GPU like nVidia or AMD it will work just fine. It only requires OpenGL 1.1, so even some really old hardware will be able to run the game.
Axe throwin'
As promised, you can pick up enemy weapons and use them. Goblin axe has a simple overhead strike attack mapped to fast attack button. Pressing Strong attack button throws it:

When your rage meter is full, you can use the sweeping mega throw attack:
