I've found two on two seperate trips (four total), but placed the two I found on my first trip at the Reaper's lair and nothing happened.Returned the following day (in real time) and found another two gems, reentered the lair and tested it again and nothing...again.(I thought the original gems may of still been active as the red glow was there, unlike the first visit). I know it requires three reaper gems to summon him.Anyone know if the reaper gem fragments respawn or have I botched any chance of summoning him?