Do classes stack with abilities?

So let’s say you’re using a paladin class hero which has a chance to give itself a defense buff, will that stack with other defense buffs? Or if a sorcerer slows down mana gen, does that stack with other mana stallers?

According to this post from @Kerridoc, talents stack with other similar buffs/debuffs:

I think that seems logical in keeping with troops stacking.

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