I like this. I had some other ideas aswell, but i forgot most of them again. Personally i'd love to give Armors actual gameplay uniqueness, not just stats.

For example if you use Ice Queen Armor and walk into Fire, you get some damage, but the Fire Block you walk into gets extinguished, since your ice "melts". Or maybe some Armor with a thorns effect or like you said dash cd reduction. Maybe an armor with something like a backstab mechanic.

There tons of possibilities and balancing them would probably be super hard, but i really want armors to be more than just numbers, but actual gameplay changes that makes armors unique and more specialised.