also, the different weapons will affect the damage done by the Specials. I did a test with the 4 MH Wizard weapons and Twister on each, and Twister does different damage depending on which weapon it is on.
Gauntlet: Blast-16.2K Twister-43.1K
Staff: Comet-7,687 Twister-30.8K
Wand: Barrage-4,762 Twister-19K
Sword: Pierce-6,562 Twister-21K
this is on the Every MH & OH Weap - Quick Reference Guide. I didn't do a test on Warrior or Rogue weapons at the time, as I was focused on my Wizard. my test was on level 100 base items with only 25% item quality. no other boosts to damage.