Imo, I see the succubus as more of a threat in the beginning. The Solstice IS better, but I agree that attacking it in the start would be a waste of time. Taking out the succubus before it uses its spells to screw someone over would be more beneficial.

Edit: Oh yeah, and what about casting Manaflare on Gradma Conquista? ;O. Unlimited 15 damage hellfishy spell..