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Cerydra (3960 of the light calendar)

Terravox (3961 of the light calendar)

Aglaea (4029 of the light calendar)

Castorice (4123 of the light calendar)

Mydei (4284 of the light calendar)

Tribios (4295 of the light calendar)

Cipher & Anaxa (4534 of the light calendar)

Hyacine (4602 of the light calendar)

Hysilens is the last one standing

Terravox (~2000 before the light calendar)

Tribios (3720 of the light calendar)

Aglaea & Hysilens (3860 of the light calendar)

Cipher (3942 of the light calendar)

Anaxa (4065 of the light calendar)

Mydei (4071 of the light calendar)

Hyacine (4297 of the light calendar)

Cerydra's year is not mentioned

Castorice's year is listed as "???"

It's actually rather easy to explain.