All these skills would be much needed, especially since Marauder/Warrior already got a HUGE buff in the past and Gladiator/Paladin were left behind quite a bit...

Circle Slash would be perfect for AoE attacks to keep hate.
Luminous Spire would be another amazing AoE attack, and if it continues to reduce magic defense...
Red Lotus Blade can make use of that, and deal fire damage on that reduced magic defense.
Howling Vortex could be a nice debuff for us to use, and maybe it can have a bit of range to it?
Spinstroke would be perfect for situations where you're the off-tank and want to deal some damage instead of standing around.
Phalanx can be a nice Enmity Increasing alternative to Shield Swipe.
Still Precision will be great on boss fights where you as the tank cant wear large amounts of Accuracy gear, but still need to hit it.
Deflection and Onion Cut are perhaps two abilities that wont be super needed, but they help.