Double Hit, with Dire Flail Smash, and Improved Trip, plus size increases etc is a reasonable way of getting damage; a Dazed Tripped target is going nowhere, as Dire Flail Smash proc's on "hit". Based on Fort Saves as well, so as ever with AoO builds, Size increases, and typical King of Smack chains get you there.
As a double weapon, the best one in the game is a Quarterstaff thanks to the number of Druid Buffs you can put on it
- Spikes
- Shillelagh
- Spellstaff
- Entangling Staff
- Wands on both ends
- Actually making it out of a true staff, give it charges of things like CL20 Greater Mighty Wallop and Greater Magic Weapon, Giant Size etc
Druid 1 is a decent dip, as you can pick up Wis to AC, Fast Movement, Rage, Favoured Enemy, and the Druid spell-list
For those wanting to get Exotic Weapon Proficiency without having to spend a feat, the Master of Masks doesn't require a feat to get in (but does require several cross-class skills), but Gladiator Mask provides all exotic weapon profs. A Silverbrow Human picks up Disguise as a Class Skill, and Bluff/Perform I'm sure can be achieved in some manner.
In regards to Gishes, Wu Jen Jade Phoenix Mages get both Giant Size and Body Outside Body. Assuming the Clones are exact clones of yourself at the time of casting, with you can turn yourself into 5 Colossal attackers. Throw on maneuvers and you're golden.
