Servant, Soul
Lark's Unseen Servant resembles him but isn't actually him.
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He was Lark's first and only servant. Lark described him as the only person he was close to at the time. He helped Lark escape from Yarrin after Maya cursed him. Unfortunately, he died in their escape attempt, specifically dying in Lark's arms. Lark later buried Reginald himself.
It was eventually revealed that the pocketwatch Lark carries belonged to Reginald. Lark also revealed that Sarenrae was Reginald's goddess, not Larks. He apparently always talked about her. At the beginning, Lark and Reginald didn't start on great terms, Lark being a brat, but Reginald was patient and fought back once Lark got ollder. When they were alone, he would call Lark by his name.
Lark then began to use Unseen Servant, shaping it to resemble Reginald.
When talking about Reginald, Lark said he'd do what he could to emulate Reginald.
Lark revealed to the party that Reginald was a dear servant that passed away but his soul didn't pass on and was in fact being kept somewhere in Yarrin.
Sarenrae spoke to Lark, asking for his help in saving Reginald (S62).