Well this took me a while, but after poking through the sound files, behold, everything the two altar spirits say:
West Altar.
Generic (Any champion.)
"I serve you, as I must."
"I aid you, because I must."
"Endless conflict."
"The shadow of death."
"Nothing ever changes."
"Their graves awaits"
"No rest in death."
"They will share my torment!"
"Eternal suffering!"
"This place was once so... beautiful."
"They will regret coming here!"
"Please, end my torment!"
"You must destroy us! ALL OF US!"
"The curse can never be broken."
"I still remember. Only fragments... but, I remember."
"Has he forgotten me?"
*The rest are her breathing*
Elise.
"Your power is not worth the price, Elise."
"Your humanity traded away, and for what?"
Hecarim.
"Remember who you once were, Hecarim!"
"Mordekaiser is not to be trusted, Hecarim!"
"I aid you because I must, Hecarim."
Karthus.
"What kind of man embraces death?"
"No good will come from your sorcery, Karthus."
"I also hear the songs of the dead."
Mordekaiser.
"Mordekaiser... are you also a prisoner?"
"I serve you, as I must, Mordekaiser."
Yorick(Everything she says to him sounds incredibly sarcastic.)
"Alas, poor Yorick!"
"Are you lonely Yorick?"
"As you wish, Gravedigger."
Any Shadow Isles Champion.
"Their death is inevitable."
"Our plague spreads."
"For the King!"
"Misery loves company."
"Finish them quickly."
East Altar.
Generic.
"The living must fall!"
"I will aid you, for now."
"Bring swift death!"
"Make them one of us!"
"The Shadow Isles hunger for souls!"
"They will rise as one of us!"
"Slay, and be slain!"
"There can only be one end to this!"
"I grant you my aid.
"Fear the Shadow Isles!"
"Everything will die."
"For the glory of the Shadow Isles!"
"We will be unleashed!"
"Kill them! KILL THEM ALL!"
"Sometimes I-I can almost remember... her face."
*The rest are him laughing*
Elise.
"The spider welcomes you, Elise."
"We thank you for your gifts, Elise."
Hecarim.
"Lead our charge Hecarim, and let the living tremble!"
"They will fear the thundering hooves of the dead!"
Karthus.
"A man who chose to join us... Glorious."
"Unleash us, Karthus!"
"I serve you willingly, Lich."
"The dark requiem will be the last thing they hear!"
Mordekaiser.
"I serve you gladly, Mordekaiser."
"Free me my lord so I may aid you!"
Yorick.
"Get to your task, gravedigger! Make our numbers endless!"
"Bring out your dead! Bring out your dead!"
"Slay them, gravedigger! Make them serve us!"
Any Shadow Isles Champion.
"The living must die!"
"Make them suffer!"
"This place will be their tomb!"
"Bind their spirits to the Shadow Isles!"
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Some interesting things in here, though I wonder why there are no interactions with Eve.