Boost speed on all items that can actually boost it, including boots, magic lucky rabit paw amulet (best one in the game no-brainer as soon as it gets +2 speed) and armor (cloth armor and sometimes robes can have speed), one ring should preferably be with stun immunity on each character (rain + blitz bolt is a very powerful combo-wombo you know), and you should generally stick with rings +int and +speed, same goes for sarongs (till endgame i managen o get all these with +2 int and +2 speed). Good belt is ancient human skull - it gives +int, no sold belts do that AFAIK. Int at about 17-19 at endgame is more than enough. Base attribute points always go so you have an uneven amount of speed - should be about 15-17 by endgame, then base points go to int and some con. By endgame staff damage doesn't really matter, so get one with better bonuses, yet better get two wands - which means two times the bonus, even if you would never ever shoot them and don't have dual wielding.
After hitting around level 10-11 dual lone wolf play gets generally easier.
BTW if you have dual casters always try to summon something (skeletons
) to soak up the damage.
And don't forget about oath on both chars and melee power stance (yes, it boosts magic damage), however stance is usable only with a staff - you should decide what is better, two bonuses from wands, of the stance.
