(Crippling Crush Con mod damage on slow/immob, Sudden Roots Slows until end of enemy's turn on an OA)
yeah its only 3, Dwarven Weapon training, Crippling crush, and Sudden Roots
it gives you one more feat slot to play with
its a bit feat intensive, but you become uber sticky and painful to be around
particularly for 1 encounter/day which is all you need here
but the warden has a couple of other difficult terrain/slow kind of shenanigans