"Damn the Regalons!"
"Yes, I am willing!"
"Stop the Regalons. Since they are bent on destroying this world with us, let's give our all to destroy them."
"They are disappearing."
"I don't sense the geneline connection anymore."
"Are we really going to be immortal?"
"Who the hell cares?! If Regalons succeeds, we are going to die anyway."
But these fools didn't know that they went right into Grimworld Tree's trap.
If Almond and Lily actually succeeded in blasting a way out, this would also give other people a chance at life because they had a chance to get out and enter Grimverse.
But if they 'become immortal' now to support Grimworld in stopping Almond and Lily, their fate was sealed.
They just died the most gruesome death because Grimworld was literally devouring their raw energy and refining their souls.
Technically, it was right according to Grimverse because it was indeed making those people immortal.