I have gotten 14 rune shards for the Tome of secrets and I can't do anything with them since I already have enough to build it. Since you can only build one, getting more of them is useless, why can't you use rune shards for whatever AW you want? It is stupid that they are only usable for specific AWs. In addition, I got 1 for the Crystal lighthouse when I first unlocked it, then I got another one shortly after and wouldn't you know, it turned into a broken one because of course it tried to go into the one slot that was already occupied... nothing like making this harder than it already is, huh? Give me a break.