Grimrock

If you stand facing the niches, turn left, then back up. if you look up to the next level, you can see something bright green up there. anyone figure out what that is, or how to get to it? There is a hidden switch in a corridor a small distance away from that spot, that will lead to the green cryst...

Meteor shield is in the Sewers, in an alcove in a 3x3 room. Picking it up closes the room off and the Leprechaun appears with a heap of firebombs. It also releases the Fire elementals into the Sewers (one near both exits to the room).