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Grapple Single Action
Attack
Source Core Rulebook pg. 242

Requirements: You have at least one free hand. Your target cannot be more than one size larger than you.

You attempt to grab an opponent with your free hand. Attempt an Athletics check against their Fortitude DC (FORT mod +d20). You can also Grapple to keep your hold on a creature you already grabbed.

Critical Success (DC: FORT+10): Your opponent is restrained until the end of your next turn unless you move or your opponent Escapes (page 470).
Success: Your opponent is grabbed until the end of your next turn unless you move or your opponent Escapes.
Failure: You fail to grab your opponent. If you already had the opponent grabbed or restrained using a Grapple, those conditions on that creature end.
Critical Failure (DC:FORT-10): If you already had the opponent grabbed or restrained, it breaks free. Your target can either grab you, as if it succeeded at using the Grapple action against you, or force you to fall and land prone."