Ultima VII: The Black Gate
Sent in by Sylver
You end up in the black gate sanctuary, and kill the leader of the church
and his two flunkies (to make this easy, cast death vortex on yourself,
yes yourself). You then take the square, triangle, and spherical pieces
and place them in the respective slots to lower the barrier around the
black gate. The Guardian gives you (the Avatar) a choice, since the gate
is his (her) only way home. If you choose to go through the gate, then
all is well until a few years down the line, when the guardian comes
to earth and kills everybody. To destroy the gate, you need the crazy
wizard's magic wand...the one that makes blackrock blow up. The
guardian starts reaching through, but since the gate is made of solid
blackrock, it'll shatter and the guardian will scream his curses at the
Avatar, and you'll be left with no way home.