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If you successfully grapple your victim you will put them to sleep for a duration of up to 1/2 of your strength (in hours). It will also slow their regeneration and delay you for 5 rounds. You can only use grapple during solo combat (i.e. it's just you and your victim fighting). The delay is 3 rounds on failure. If the victim is 5 sizes smaller or larger than you then you have a higher chance of failure (the small ones slip out, the big ones are hard to get a good grip on).
grapple <victim>
See also: Poison