Ursula
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Probably, the Unicorn isolated Arandor and Heroist (double ND - Etienne is alive).
Kapelan was defending Heroist.
In this same paragraph, the Hydra's bite seems relevant, although I'm not sure if it means someone from the characters was bitten.
The Orc MyHighness finished off Hekasan, who had defense.
The Orc wasn't healed, meaning he died from the wound he received yesterday. Therefore, the formal logic points to the Knight of Dawn as a suspect, so we shouldn't focus on that.
Vesper, a Creature, died from a shocker - this is a good clue.
Ruddy was attacked by X-role/Oxford, and Renard defended him; this is also a clue that we should keep in mind.
Какую бы чушь ты не нес, в ней всегда есть крупица правды.