Hello im new to this game and i am currently playing Crab. I have a question about seal of the crab that gives berserker trait to a character. What is the berserker trait? Is the vengeful berserker's ability or something else? I have been searching google but nothing came up. Thanks in advance

Traits do nothing on their own, they are merely text for other effects to work off of.

See for example the crab card Crisis Breaker.

Much obliged