TrueWoW

http://wotlk.openwow.com/quest=10111
http://www.wowhead.com/quest=10111/bring-me-the-egg

Windroc Matriarch spawns as intended, too bad i get the "invalid target" if i try to attack it.

This quest works and you dont have to attack the npc as it will attack you but you have to wait for it to complete its wp before it removes unit flags to allow to be attacked and attacks ie you cannot attack as soon as spawns as you have to wait to complete wp,

Also note that if npc evades (ie leaves combat) after entering combat this will reset unit flags and npc will again become unattackable so you must not use any abilities to leave combat,