Ninja: Walk in shadow.

[MartaDemireux]

Poison effects =/= traits for poison. And I didn't see any movement speed traits except the one reducing the penalty while stealthed, but I might have missed something.

移動速度アップ (Lv28) - Movement speed up.
-> 自身の移動速度を上昇させる - Increases personal movement speed.

And:

コンボB-1効果アップ (Lv44) - Combo B-1 effect up
-> コンボB-1の継続ダメージの威力を45に上昇する - Combo B-1 DoT increased to 45.

Just shows that the class action that leads to the combo has plans on being increased via traits. That hints that the class action could be cross-classable.