Quote Originally Posted by Vyrerus View Post
To expound on this, if you pierce any soul with a pure aether blade, then the soul will be destroyed rather than return to the lifestream. This is part of what made Haurchefant's death so poignant. That javelin of light, "Spear of The Fury" was meant to kill and destroy an immortal Echo user(the WoL). Instead it kills Haurchefant, body and soul.
Except it didn't - Haurchefant came back after all in the climax of the Final Steps of Faith in spirit alongside Ysayle who helped the WoL, Aymeric and Alphinaud pull the Eyes of Nidhogg from Estinien's armour, after they succeed in removing the Eyes and freeing Estinien from Nidhogg's control and banished Nidhogg's spirit forever, they're last seen doing an 'Aerith and Zack' from Advent Children when they smile, and then walk into the light and disappear. So their spirits are most definetely not destroyed aetherically like what befell the Ascians (presumedly they returned to the Lifestream after that).