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Setup:
A huge creature is standing in front of a sheer cliff drop. Another huge creature is bullrushing the one right by the cliff. No part of the creature's base is off the cliff.
The bullrusher succeeds in only moving the cliff enemy 5 feet...the enemy of the bullrusher is now pushed back 5 feet and thus has 1/3 of his base off the cliff, but 2/3 still on it.
What in the world would the DC be for the creature on the cliff, especially when 2/3 of him are still on the solid surface?
X= ground
E= Creature on Cliff
Pre bullrush:
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XXXXXEEEXXXXX
XXXXXEEEXXXXX
After bullrush:
EEE
XXXXXEEEXXXXX
XXXXXEEEXXXXX
XXXXXXXXXXXXX
Also, will the bullrusher, who is large, need to move adjacent to the opponent he is bullrushing, or can this be done with the huge creature reach?
In the above example, let's say the Bullrusher is B. Is the placement correct, if he bullrushed from 15 feet?
EEE
XXXXXEEEXXXXX
XXXXXEEEXXXXX
XXXXXXXXXXXXX
XXXXXXXXXXXXX
XXXXXXXXXXXXX
XXXXXBBBXXXXX
XXXXXBBBXXXXX
XXXXXBBBXXXXX
In this situation, the huge creature who is hanging off the cliff easily fits the definition of squeezing, and should probably take the penalty while in that position (-4 Attack, -4 AC). This will reduce its CMD by 4 (since any penalty to AC also applies to CMD), so no need to make additional assumptions about changing the CMB's DC.
For the second part: CMBs (and other attacks) are based on the attackers' range. So assuming 15 ft reach, yes, you could bull rush from that range. No need to be base-to-base.