Other popular tactics include making the Wraith of Wrath cry like a baby under a swarm of Mordenkainen's Swords... but since,
1) Leslie is playing no-summons
2) R/C cannot get MSwords anyway
Energy Blades should be useful, but they have a tendancy to run out fast unless you dedicate a lot of spell slots to them, and this might prove problematic for stage 2 and 3 of the fight.
Slings can surprisingly be your saviour here. One Sling of Avoreen, some +2 enchanted bullets and an Oil of Speed. This way, you can conserve your level 7 spell slots.
If you insist on using Energy Blades... put the Flail of Ages in your off-hand before you cast the spell.
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