Good idea!

Ailments can stack up to 30 in no time if you invest a bit into it so with your suggestion it would be 150-450% which is way over the top. It used to be 100-150% if I remember correctly and that was overpowered as well.

I agree that 10% is a bit underpowered considering Immortal Offering is still 70% but you have to work a bit to get that to 70%. An avarage IO is about 30-50% so that would be a good target here as well.

Make it 2% per stack so investing into max ailment stack would improve this effect as well.

Sure, thats over the top if one can reach 450%. Anyways, one could cap it - lets say at 75%. So its independent of passives that increase stack-size,

I have many ideas for a lot of nodes. But i am neither a developer nor have an overview of their intentions. So im not delving deeper in developing ideas.
The most important information is simply "its way underwhelming with only 10% dps increase". And i guess we can all agree on that :D

We can agree on that but there are a lot more impactful balance issues with the game than this one underwhelming node. Basically all of the skills feel useless after you tried Arctic Spear or Havoc Orb.

I posted about this a few weeks ago and some good fellows replyed there if you want to read their thoughts.

https://wolcengame.com/forum/feedback-suggestions/passive-skills/which-time-cannot-heal-passive-10-huge-nerf/