This is exactly the reason why I didn't bother to tryhard Tiamat, finding only 4 copies would've been a complete waste of time. At least I had the back-up option of the Ori Shop if this had gone wrong.
Back-up option? How? Because the last Raid weapon in the shop is the Vland Lance and that won't change for a long time, not even in DMM they updated it because of those "epic-quest".