Ple-Sen
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The only remaining negatives are a useless defect (cannot kill anyone and has no say) and two dragons.
Neyra is most likely a dragon. She wanted to execute Lord (although, I admit, I considered him a defect), but she didn't want to execute Rimpel-Daskalos. The clue about the dragon's fangs also points to her, but it's not conclusive. Vissi, I think, is a minor creature.
Please note that there was no murder by the maniac while Warrior was in the block. So, I would execute him.
And Amko, by elimination, is the defect.