Would you look at it? Just look at it!

[Bruseidon]

Trophy guide says there is a quest for this in protector's enclave. I'm lvl 80 now and still haven't encountered the quest. Where and when does the quest appear?

[Kavatus]

Quest that guide mentions is just for Protectors enclave and is one of introductionary quests so you should have done it. If for some reason you havent, go to options and put check on show low level quests (or something similarly worded) to find quest. 

Other areas doesnt have quests for scrying stones. Use guide implemented on guide to find other scrying stones.