Xasha's Skill guide (with iPhone screenshots)

[Duke]

then freeze them with Ice Storm, combo with Firestorm, and follow with Lightning and debuffs as necessary

I don't do much soloing, so I disagree with this order. I'd start with the debuffs as soon as the mobs are rounded up, then Lightning, then the Hot Flash combo, and then back to Lightning, which should have recharged by then, being ready to drop a Heal if anyone (including myself) needs it at any time. In any event, Lightning before FS/IS gives you a chance to drop a second Lightning as soon as you finish off the combo.

[Pharcyde]

I don't do much soloing, so I disagree with this order. I'd start with the debuffs as soon as the mobs are rounded up, then Lightning, then the Hot Flash combo, and then back to Lightning, which should have recharged by then, being ready to drop a Heal if anyone (including myself) needs it at any time. In any event, Lightning before FS/IS gives you a chance to drop a second Lightning as soon as you finish off the combo.

Weakness --> Nightmare --> Lightning --> Drain Life --> Ice Storm --> Heal --> Fire Storm --> Frost Bite.

^^ One hit mob kill Pve Combo.