So I have thes wacky ideas for boss fights in Uru...
Suppose in an age you come to a room with a big computer screen. When you enter it says the security system has been turned on, and all the door's lock. The screen will also have "health" counters for, say, the 'computer' and the 'intruder.' And then you'd have to play some sort of mini-game. Like maybe a bunch of switches in the room will light up in a certain order, and you've got to press them in the same order, or maybe the reverse order to make it harder. If you mess up the order, you'll lose some 'health' on the screen, and when you get the order right, the computer will lose health. When the computer's health reaches 0, the doors unlock, but when your health reaches 0, the floor will start to move away, revealing a floor covered in spikes, and the explorer will have to Relto out. If a lot of people enter before the door locks, they can work together, if some people get locked out, they can watch the 'battle' through a window. There could be some strategy involved, though; once defeated explorers come back, an explorer who got locked out could open a shortcut that lets them get right back to where they were, so you may want to leave someone outside.
ALSO how about if you come to a room with a grill flooring, and underneath is a malfunctioning device that sprays a toxic gas upward. Earlier, you could find a journal that says the gas makes living organisms panic and feel an overwhelming desire to escape. So if you get it, you'll panic link. So the device will move around under the floor and you'll have to avoid it. And I guess, I dunno, you've got to turn it off somehow.
Cute idea, huh?