Re: What happened?
 

Maybe this post about decay damage by Kristoffer O helps for this discussion as well: Post#325726

...so I would guess that not all banfire/decay effects are of the same 'quality'.

BTW, is there a cap on the regeneration rate? And do they all add up (e.g. does 'casting the spell personal regeneration', 'regeneration from items', 'regeneration from a blessing effect' and an 'innate regeneration ability' always stack? Does the regeneration percentage stack additively?)

Re: What happened?
 

I believe, like many of the other game effects, they can stack, to a point. Like, you can have natural regen, A spell related regen, and item regen. I'm not sure if 2 regen items stack, but I know the spells say that they don't stack.

Re: What happened?
 

Surely, two of the same kind will not stack, but I think that I once tried to stack a 'Hydra Skin Armour' with a 'Ring of Regeneration' and that richt-clicking the regeneration icon showed successful stacking. I am merely wondering if different kinds stack (spell, item, bless & innate).

Re: What happened?
 

Spells don't stack. I think it would be cool if they did. Some people have complained about battlefield enhancements not stacking, as it would allow regular units to easily take SCs.