Si Vales Valeo

(Comes at max level)

Valentine's Return Gift from Caligula.
Increase Berserker Coin Choco drops by 2.
[Revival: Valentine's Event 2018 Lite Only]

Valentine's return gift from Caligula.

"Your happiness is my happiness."

A bust of Nero.
It seems Caligula tried his best to maintain a stable frame of mind while sculpting, and so the sculpture is his thoughts given form.
In other words, it's a gift that represents love.