Prevent life regen on monsters: other options besides Frost bomb?

I'm wondering: are there other options to stop life regen from monsters besides Frost bomb?

Life mastery for 50% reduction. There's also an Eater mod on helm that goes up to like 82% reduction, I think, but it only works on enemies you hit. There's also a version of that with higher % (90 maybe?) for unique/pinnacle boss presence.

Life Mastery (50% reduced) + Ryslatha minor Pantheon (50% reduced for monsters you hit recently) carried my RF through everything with life regen, including 80+iiq invitations with Cousecrated Ground + Maven heal. If you can afford Ryslatha as minor pantheon this is the best combination I found so far.

Thanks for the tips!

The helmet mod and Ryslatha both require hits, which does not work for my build.
But I had missed the life mastery option.

How nearby do I need to be for it to work?

Can monsters regeneration go negative?

I checked and players regeneration can go negative but monsters regen can not.

Or something like this:

Mark Mastery will give you monsters can not regenerate life