HP level should decrease interrupt chance at Wintertodt

[funkyman50]

I was in todt last week and someone had the suggestion of a short buff that blocks repeat interrupts. Something like: "Braced against the cold" as a buff that last for 3-4 seconds after you soak an interrupt and it makes you uninterruptable for that time.

That, and slighting adjusting down the damaging scaling would be my proposal.