How does cold to fire affect elemental equilibrium?

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Kissan wrote:

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Skivverus wrote:

If your hit deals two types of elemental damage, they get +25% to both of the corresponding elemental resistances, and -50% to the other one, for five seconds or until you hit them again.

I thought that two elemental damage gave -50 to the other element and 0 to the elements used (like Soul4hdwn).
When this meachnism has been changed ?

This is correct - I failed to notice the numbers were wrong earlier.

Fire being present gives +25% fire resist and -25% cold & lightning resist.
Cold being present gives +25% cold resist and -25% fire and lightning resist.
Total lighting resist is -25% and -25% = -50%
Total fire resist is +25% and -25% = 0%
Total cold resist is +25% and -25% = 0%

Note that I have proposed a modifiers version of the skill to Carl, and we're likely to try that out, so the mechanics of this may be changing. you'll get the details of the new version if we do decide to change it, but I feel it'll make things a bit easier to understand.

Yes, monster resistances can go below zero.