(Unless otherwise noted, all instances below were with only a 15% group bonus and were completed with the challenge on tier2)
Annuminas: Ost Elendil gave 3, Glinghant went wonky because we tried to reset the challenge, not sure what it gives, Haudh Valandil gives 3
Fornost: 6 per wing, Wraith of Shadow gave 8 (Wraith of Earth gave the challenge seals, but had no chest)
School/Library: 3 for each, although in Library the final boss must be defeated BEFORE the crebain to get the challenge (ignore what it reads currently)
Northcotton Farm/Stoneheight: 3 each.
[OOC] Faja: 'new expansion isnt even out yet, i've already failed at it'