My paladin perished against 2 zombies in a level 1 ruin.
According to the in-game info and the warpedia, a level 1 ruin should contain at most one zombie.
Yes, this is a really a minor bug, but I think it is important to point out differences between game and documentation, especially if this particular information is presented in-game (if you click on a ruin).
(For reference: ladder game "testtt", turn 11)