Your guidance is dead.
Twenty minutes ago he was fine and dandy, but it seems that the only NEOMACRODON left in existence decided that now was the perfect moment to go extinct. Kaput, just like that.
You'd say you feel a deep sense of parental loss, but the bond you shared with your lusus never ran particularly deep. He came to you already frail and wounded, and the old coot loved to do nothing but laze around as you tried to feed him coconut juice through a straw.
He just kind of stopped after a while. You think the chemicals in the water may have turned his brain into mush.
RIP in peace.