When you finish dungeons, you can give hints to other people in your team. You only ever hear one hint from those group of heroes who made it, but those who die? Their spirits haunt those dungeons, and instead of ruining everyone's day, they tell the player their hints. It's pretty neat! The location of the ghosts itself is, of course, also a big help, as it helps with identifying traps.
Poor ghost dudes.
[EDIT: I am aware its a bit hard to read in the shot. The whole thing is animated ingame, so just by that it's easier to read. But I definitely want to make sure that text never disrupts gameplay, so it appears with no trigger, and only transparent (and thus cannot hide anything important)]
Perhaps this post will get me points for originality at least.
Check out Dungeon Deities! It's amazing and will make you happy, successful and almost certainly more attractive! It might be true!