Ursula
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The Hydra starts with two heads and a saturation level of 1. If it eats someone, the saturation level becomes 2. Now, if it loses a head, at the beginning of the night, it will have three heads (2-1+2) due to the saturation. That's it. In other words, the head limit is increased by one, and the saturation turns into heads.
Какую бы чушь ты не нес, в ней всегда есть крупица правды.