How to use Martyr Wraps?

Got this at the end of the quest. Trying to figure out how they can be useful?
When worn, gives you 5 stacks of corrosion, but makes your attacks apply corrosion on monsters (it stacks). Costs 70 to prepare from locker.
Taking 5 extra damage is rather brutal in the beginning, and towards the end, it doesn't do very much. Yea, you could attack the boss early and make the boss take a tad more damage, but still compared to a simple increase in base attack power item, you would need to stack quite a lot before it start paying off. I could possibly see it being useful against monsters that have a really high physical resist, but I don't think its worth using even against tower of goo.
When worn, gives you 5 stacks of corrosion, but makes your attacks apply corrosion on monsters (it stacks). Costs 70 to prepare from locker.
Taking 5 extra damage is rather brutal in the beginning, and towards the end, it doesn't do very much. Yea, you could attack the boss early and make the boss take a tad more damage, but still compared to a simple increase in base attack power item, you would need to stack quite a lot before it start paying off. I could possibly see it being useful against monsters that have a really high physical resist, but I don't think its worth using even against tower of goo.