[Neus]

I don't think DR needs a cap. As I said earlier, even though it was about resists but they're very similar, if DR stacking can get too high then the instances of damage reduction should probably be reduced overall or made weaker/incompatible with each other.

For example, making Evasion a main class only skill would get rid of it stacking with One-on-One. Reducing Wraithguard's effectiveness could also be warranted, or changed in a way to where if Ghost isn't your main class, its reduction is lower.

Putting a hard 'cap' on DR probably isn't a great solution. The same probably also applies to damage amplification sources; rather than trying to fix it with a sloppy cap, the overall effectiveness should be lowered and/or reduced for certain class combinations.