Useful meanings

Armour class - This is the total amour of armor a character is wearing, when attacking of being attached this is the number that must be beaten to have a hit.

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Hit points - amount of life the character/item has. when a PC is reduced to 0 they become unconscious, when anything else gets to 0 its either dies of is destroyed.

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Hit / DC - This is the number calculated after rolling a d20 and adding any modifier from strength or magic