sanctum entire map revealed without all-seeing eye or room reveal relics

https://imgur.com/KEJ8e02

it is possible to reveal the entire map in sanctum by repeatedly portal-ing out to town and re-entering the sanctum. worked for me in the first room of a floor, with the boon "scrying crystal". probably requires scrying crystal, haven't tested without it.

update: all rooms revealed this way "unreveal" after entering the next room, and cannot be re-revealed with the same method, because portals into a half-finished sanctum are unusable.