Hello,
I had a question about the Unchained Monk's style strike, Leg Sweep. Specifically I was wondering what you roll for the trip attempt. Here is the text for the ability:
Leg Sweep: The monk attempts to sweep his foe’s leg, knocking the opponent down. If the attack hits, the monk can make a free trip attempt against the target of this strike (using the base attack bonus of the attack used to hit the foe). This trip attempt does not provoke an attack of opportunity. The monk must attack with a kick to use this style strike.
Is the trip roll just the Monk's base attack bonus or do you use the base attack bonus of the attack as part of their CMB?
I'd appreciate any help with this. Thank you.
using the base attack bonus of the attack used to hit the foe
The same BAB used to calculate the triggering attack.
Basically your roll for the trip attempt is the same as your attack roll*. However there are caveats, things that only apply to unarmed strikes (or rather things that wouldn't apply to a normal trip CMB check) aren't included, and you would still include any normally bonuses to your trip attack.
Basically what they're trying to say is you take your iterative attack penalties on the CMB check to trip.