Loot and attunement
Classic loot: Nightmare Dragon shared loot table.
Description
Emerald Dragon of Nightmare; putrid mushrooms. Rotating spawns at the four Great Trees: Duskwood (Twilight Grove), Ashenvale (Bough Shadow), Feralas (Dream Bough), The Hinterlands (Seradane).
Forever evidence
No Forever statement. Wowhead/Blizzard recaps and LFCarry list world bosses as unpublished. Classic world bosses drop raid-tier epics, and Blizzard says original iconic raids 'have not opened yet', so launch availability should not be assumed; status left Unknown rather than presumed present.