What happened?

[Chazar]

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).

[BigDaddy]

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.