The source dragon had mentioned a cycle so here’s my head cannon
Like in Lloyd’s visions most if not all his friends would die. Only leaving him alive and bc of the cycle existing it all would come back to where it started but the realms are merged so Lloyd would have to unmerge the realms
And you can’t really leave signs of civilization before civilization since that wouldn’t make much sense so Lloyd, after all huge battle that resulted in everyone dying with only him alive (since he’s like a demi god and he still has work to do), goes around the merged realms to destroy all evidence of civilization
He’s heartbroken since be doesn’t want to destroy the place he’d grown to love but at the same time he couldn’t stand looking at it since it reminded him of his failure so he just wander around destroying everything while silently sobbing. No one is there for him anymore…
After that life gets recreated and the cycle starts anew