ToME: the Tales of Maj'Eyal

High Peak: Sanctum's portal areas (the ones that go to the east and west continents, not the monster ones and the portal in the middle) need to be flagged as vault tiles--as a temporal warden, I've had anomalies teleport me to those portals even with the 5+ wall thick block (which you can't dig through) between them and the main area. The funny part is, you can then use the portals to leave and do w/e, then come back to resume the fight at your leisure. Even MORE funny, is that the anomaly ended up teleporting one of the two bosses to the OTHER portal area, which I discovered after destroying all the monster portals and the other boss and sitting around with nothing happening wondering "now what?" (I inscribed myself with a teleport rune which I spammed until I ended up in the other portal room, and sure enough there was the boss sitting there, twiddling his thumbs)

I've taken regular rest breaks in those rooms via teleport on one guy, after mistaking them for the way to stop adds and walking back up the peak to try again. (He managed to fail anyway, bad builds are bad. but still. Ick~)