The Scenario
Greater Sci-Fi combatant
Originally posted by CosmicComet
EDIT: OH SNAP. MS doesn't hurt Agahnim, that's right. No explanation for this whatsoever Scenario? I'm surprised dawg.
http://www.zeldawiki.org/Agahnim#cite_note-11
"Listen well, Link. Even with the Master Sword, you cannot inflict physical harm on the wizard. You must find a way to return his own evil magic power to him." — Sahasrahla (A Link to the Past)
No explaination is given. You just can't hurt him with the artifact you spent the entire first part of the game tracking down. However, only the Master Sword (or butterfly net as a joke) can reflect the spells back at him. I might say something about physical harm as opposed to any harm to mean Agahnim is just the projection of Ganon's will or something.
The plot of Link to the Past is Agahnim trying to unseal Ganon from his Dark World prison. If Ganon can escape the prison well enough to possess someone, he wouldn't need to unseal himself since he'd already be free. Based on the split soul thing, Ganon could only partially free himself, and that part manifested as Agahnim.
Did Twili magic give him any other abilities, or just possession?
If Agahnim really is Ganondorf's alter-ego, then it isn't mind-control or possession (though Ganon appearing from within his body suggests that it is possession IMO).
His Twili stuff amounts to portals, turning to particles, his giant head form, and I guess whatever he gave Zant.
I'm not sure what the appearing from Agahnim's body is, though literally seconds before Link fights Agahnim the first time, he succeeds in breaking the seal of Ganon's prison. After the fight, Agahnim brings both himself and Link to the Dark World, where I assume Agahnim recombines with Ganon. It's only after the second fight that Ganon appears from his body.