Reading a Forbidden tome (for example, Day it Came) AFTER being beaten by Urkruk in the Ambush event (after Dreadfell) but BEFORE leaving the Ambush "zone" causes the Ambush event popup to happen again upon returning from the Forbidden tome.
If you then die in the future (no time/zone limit as far as I can tell), it will proc the "ending" of the Ambush event, restoring you to full health and giving you a 1 million dmg bubble instead of killing you. It will also despawn all enemies on the current level.
E: Bug only works with books that don't use your own character (The Day it Came & View from the gallery). Additionally, you can NOT stack these triggers by reading multiple books
1.6.6 Ambush event & Forbidden tomes
Moderator: Moderator
1.6.6 Ambush event & Forbidden tomes
Friendly Neighbourhood Moderator, moan at me for a teleport if ya get stuck.