ok gorshalac is not yet in the game WICH IT SHOULD BE PSHAW!!!!!! but it is sargeras's sword and mind you the titans created it. im bored so here goes Sargeras was once a Titan and was given a job to protect Azeroth. he banished and prisoned thousands of demons. in one of the more epic battle sargeras went mad and released all da demons he prisoned so released DA LEGION!!! DAKKA DAKKA DAKKA!!!! he fled azeroth and has been ravaging planets and employing more demons  to his rein now. he came back to azeroth cuz the retarded elves were using magic from th well of Eternity and he caused this huge explosion which caused the great sundering and gave us Estern Kingdoms. he left again and is on some dmony planet. Alot of sargeras's demons havn't even been seen in WoW and they look SICK!!!! sry im bored read it if ya want

Do you really think that's all the Skull of Gul'dan can do?  It's much more than a powerful trinket. Try reading wow's history a bit, especially what Ner'zul did with the Skull of Gul'dan and the 2 other items.