I recently found a unique item, which had an affix which is also a gem affix. Like all gem affixes, there is a mana cost and a level requirement listed for the gem type.
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Does the item then have an inherent mana cost due to the affix?
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What equivalent gem level does the affix attach to the item (i.e. lvl 1 or item base level?)
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Does the affix level up like a gem?
I gave it to a party member so I cannot test it.
In this instance: Culling Strike
Best Answer
Culling Strike on an item is not equivalent to the gem, but simply means that item insta-kills mobs below 10% health with no other effects. There is no inherent mana multiplier or leveling that can occur.
There are also item mods which read "gems in this item supported by level x support gem" which will increase the cost of the supported skills. These effects are constant and do not level up like a gem would.