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Spoiler theory
I theorized a while back that this Thesilid is the same as the being that was trapped in that dungeon where Aillette got that save disk. The unknown being that was trying to figure out who she was and was later crushed to death.
Which explains the sudden loss of language abilities because he’d been trapped for SO long and a fear of the dark.
Did teslid fuse with the demon lord, I remember a spoiler describing that teslid is indeed the same person as the demon lord and the sealed guy