Intresting i cant seem to find who asked

Certainly not you

Hahaha... ): this wiki is dead

Obvs

Opposite elements deal double damage to each other.

To clarify, if you have an elemental affinity, you take half damage from your own element, but double damage from the opposite element. So someone with a Fire Affinity takes half damage from fire, and double damage from water. For a Water Affinity, this is reversed - half damage from water, double damage from fire.

Interesting

So then elements are inert and have no special/beneficial reactions with others then

I mean, if you have an elemental weapon, you get double damage against the opposite element. For example, if you had an equipment set specifically for going to the nether, a Water Affinity sword would be super useful, because it would deal double damage to fire mobs.

Question here is, what is the opposite element? for things like water and fire, light and dark, the answer is clear, but it is not so for different weapons

Any weapon can have an "affinity" added to it, regardless of material. It's called an Augment, I think.

Funny, affinity is defined as "The object will be more receptive to enchantments of the specified affinity."

Thats actually not what i expected, but i guess that means affinities dont actually make the weapon deal that sort of damage

I do believe, tho, that a fire affinity weapon will definitely increase damage of fire enchants, and it may even increase the stats of a material with fire affinity