Trit One-Ear
Explorer
I may also change up the succubus "dominate" power to make the actual battle with her more dynamic. Rather than making it an on-turn attack, maybe let it be an immediate interrupt when she's attacked so either the attack is re-directed or if noone is within range of the attacker then it charges the nearest ally. You could also do both, with the limit of only one creature dominated at a time. She's revealed her true nature so I like the idea that dominates are momentary perception scrambles rather than the type of dominating she'd do in cognito.
I was thinking something similar, especially in Stage 3. Giving her a free action on 10+her initiative to make a... Close Burt 5 or 10 attack? Everyone she hits makes an at will atack against a nearby ally. Using [MENTION=6694112]Kinak[/MENTION]'s idea of having a whip and using it to snare people, she can then be able to redirect attack to that target. Ultimately, I find dominate to be more frustrating than fun for players, and would rather find ways to mess with them while letting them keep their actions.
[MENTION=305]Storminator[/MENTION] - Lurkers have always given me the same trouble, both as a DM and a player. A few weeks ago my Gnome Illusionist and friends fought the solo dragon in Chris Perkin's rewrite of Hill Giants (who can turn invisible very frequently) and we did essentially that - prepared actions, then nova'd. However, making her a Lurker in Stage 2 might be useful, using the portals as a means to disappear and reappear. With all the other Cambions and Devils running around, I think it could be crazy enough to keep the heroes busy while she's popping in and out.
I'm not entirely clear on how to build a Boss encounter like this while using other monsters in different stages. Combined HP (so killing the Cambion is just as effective as hitting the Succubus)? Lower her HP (so it takes about the same amount of time to get her through this stage)? Play it by ear and hope my players are strong enough? Anyone have experience with something like this?
Trit