Thank you, that was actually a question I was looking into... I initially was going to do Lightning staff but the heavy attack is too long to reliably take advantage of the off balance state it causes also unlike most weapons you can't cut the thing short. Frost was going to be my back up but knowing this makes me a little sad. Fire it is.

Frost should cause:
- Root with Elemental Clench (shorter root if morphed into range)
- 40% chilled (snare) from all other destro abilities (dunno what Wall will do)
- 40% chilled from weapon attacks from Tri-focus

Storm should cause:
- Disorient with CHANCE to put off-balance with Elemental Clench
- 10% less damage from all other destro abilities (dunno what Wall will do)
- 10% splash damage to 2 nearby enemies from weapon attacks from Tri-focus

Fire causes:
- Knockback AND long stun with Elemental Clench
- 10% bigger damage of Wall of Elements
- all destro abilities have a chance of setting enemy on fire (DoT)
- weapon attacks have a chance to knock target down from Tri-focus (seems to be affecting abilities as well, as I had both Blockade of Fire and Impulse knocking down targets on occasion)

Since snare won't help that much to justify itself, and disorient is a plain JOKE, I'd say FIRE is the element to go with. It's just plain better than anything else.

I just guess that Fire Clench bugs out a bit - doesn't apply the knockback to mobs which are immune to stun (which it SHOULD - for example gargoyles - you should be able to knock back gargoyle (like with Magnum Shot), you just can't slow, disorient, fear or stun them)