Improved Sunder? It's a digging Constriticon and used to breaking rocks or other objects for it's job.
If we want to go exotic we could take from the Netbook of Feats:
CONTROLLED CHARGE [General, Fighter]
You can still remain defensive when charging.
Benefit: You are able to make a charge attack without suffering a -2 penalty to armor class.
CONTROLLED CHARGE Copyright 2005, Jason D. Kemp
Balance: 4.68 (Purp 4.60, Pow 4.20, Port 4.60, Comp 5.00, Rule 5.00)