Archon ---> Quake. You heard right, elements of the 80's micro game archon extrapolated into the Quake universe. Get ready for a wild ride. (free stuff | no warranty | see disclaimer.txt | blah blah blah.)
Second moving lava trick. The lava is sucked away revealing the pit bottom as a pillar descends from a glass case with a special weapon on it. The reveal shows some debris, runes and a couple monsters stuck in the pit.