How do tank mitigations stack?

[Ryaduera]

Sure, you're right, but that's not necessarily what I was asking about. I wasn't asking about all the good ways to avoid damage, but simply how certain abilities with percent reductions stacked. Not necessarily avoidances.

Arm's Length will still cause diminishing returns. Let's say you get hit by 1000 10 times for 10000 total damage.. Ramparts on its own reduces that by 2000, Arm's Length on its own reduces it to 8 attacks meaning it reduces incoming damage by 2000 as well, resulting in 8000 total damage and then adding Ramparts would technically lose value and reduce 1600 damage.

We know, and we're trying to help. It also has diminishing returns when stacked.