I'm not 100% sure this is an error, but I'm pretty sure. Page 88 of the DMG, the Doomspore obstacle, says it is a lvl 3 obstacle, but that it's worth 350XP (and can be upgraded to Elite at 700XP). I'm not sure whether it's supposed to be 150XP (and 300 for Elite) and stay at level 3, or moved to...