The Raid III quest does not update correct After 3 kills of T3 Endbosses (without killing any other Raid Named) the quest still shows: In my opinion the raid endboss should count as target too
picked up quest from boundless gulf (raid). and mine updated from 3 kills in storm last night, have not killed end boss yet Edit- Quest did complete after killing last boss in storm.
3 raid boss + 1 raid zone boss for 10 coins, they surely make it more and more complicated, evergrind )