Siverfale
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I don't know how it is on the Japanese server, but on the English server, he is one of the best Berserkers. If you max out his Bond skill to 10, he gets a CE that gives him +3 to Guts, plus his own Guts skill and an Evasion skill, making him one of the most durable Berserkers in the game, and that's important for them. So, he should definitely be leveled up.
Where do we go?
Where do we end up when we save the world?
Where do we end up when we save the world?