eyes of the rune keeper invocation = comprehend language?

[LucianoAr]

whats the difference between these two?

i mean a 1st level spell lets you understand all spoken and written, and the invocation just the written


whats the point?

[Shining Wrath]

Point is that it's on 24 hours a day. If you're stuck in an ancient library deciphering tomes looking for the location of the Lost Dungeon of Perdition, very handy.