How does armor of creatures affect damage taken by players?

Question

Every creature on game an armour value, how affect it the damage by player to this creature?

Comments

Could you make some improvements to the description and the question in general? Maybe elaborate a little bit more on what you are trying to ask. I don't really understand it.

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@Xarkost: armour is the British spelling of armor, I have reverted the edition.

Answer 1

My answer contains information valid in the ancient times, but most likely it hasn't changed at all. This info is from a multi-headed friend of a friend, which corrupted my soul with the knowledge brought by the prometheus from the gods. And it certifies that TibiaWiki Formulae article was correct. Basically, it works exactly the same as for regular players.

The armor reduces damage taken by melee and distance weapon up to its value. If you hit with a melee weapon, a shield is considered first. (Fun fact: distance weapon counted towards shield block limit and used consumable shields). Then, percentage reductions are processed one by one. Finally, an armor value A is the sum of creature's base armor and equipment (what worked for mobs at that time). The prevented damage is:

A if A is 0 or 1
⌊A/2⌋ + random_uniform mod ⌊A/2⌋ otherwise.

That is, if A is odd, then subtract 1 (call it A'). The prevented damage is chosen uniformly in the range between A'/2 and A'-1. Thus, an armor value o 1, 2, or 3 will make it always reduce the damage by 1.