Type: General
Source: Drow of the Underdark
You have mastered techniques of waging war when mounted on a monstrous spider (or similar vermin).
Prerequisite: Ride 1 rank, Mounted Combat, Vermin Trainer
Benefit: When riding monstrous vermin, you do not need to make any rolls or checks to remain mounted if your mount travels across walls or ceilings (though if you take damage when on a wall or ceiling, the DC of the check to remain mounted is 10 rather than 5).
When your monstrous vermin mount makes a charge attack, you can spend a standard action to grant it a bonus on the attack roll and damage roll equal to 1/2 your base attack bonus.
Normal: Riding a creature clinging to a wall or ceiling would require various checks depending on circumstances.