For a CR 7 character, what is the best class for a character that pretty much remains invisible (under her own power) and pulls levers that set off traps?
Also, would activating a trap negate regular invisiblity?
The set up is a crumbling temple with several large lava pits, and many tiers leading up to the altar. One big set piece, with a few crumbling pillars, lots of difficult terrain, statues, and dangerous edges along the lava pits.
One NPC is going to be a sundering and bullrushing fighter with a lucerne hammer. Another will be a druid behind the altar, summoning and blasting from cover and range. Next to the druid will be the invisible trap-springer.
The PCs are a drow warlock, a half-orc inquisitor, and a half-ogre combat brute (took the PrC from Mini Handbook that replaces BAB with +2 Strength increases).
Human Sorcerer Sage with the Seeker archetype is lots of fun. I don't think disabling a trap would negate invisibility, but setting off traps might.
An invisible spellcaster with mage hand?
I was kind of leaning towards a summoner or alchemist. Maybe a small one, so she could hide behind the altar.
Small + Hiding + arcane eye/shared senses might work better than invisible/greater invisible.
One idea I have for a trap is a weighted net over a lava pit, right in front of the altar tier. PCs might be tempted to fly or jump over the lava pit and skip some of the more roundabout ways to the altar tier, and I want a way to discourage that. But falling 60 feet into lava seems a little lethal, especially if entangled in a big heavy iron chain-net.
Maybe have one of the two spellcasters have a readied action to cast hydraulic push or something similar? Just a simple wall of wind?