How do you unlock the door? I activate the crystals. but they go off when you walk away from them. Do all three crystals need to be activated together to unlock the door?
Yes, you need all three crystals activated to unlock the door, so you probably want to bring in more friends.
3 people: You have to fight both Gurtoks (the ice and the fire) and they will NOT respawn so you can run in that area without getting into a fight. (P.S. They drop those nice level 50+ Athames and Rings which give the best Health and Mana stats of your school plus a 15% power pip chance i believe [correct me if i'm wrong]) and then you can have 3 people activate crystals and one run to the door.
4 people: You don't have to fight Gurtoks, but make a plan so that 1 or 2 person(s) can be "bait" and log out, then quickly port to either of the other 2 people in the Spyre.