mhw extra slots augment materials
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Elderseal Augment Slots 30 High - ①ーー Hidden Element This weapon's element is Hidden and will require the Free Elem/Ammo Up skill to unlock.
Max equipment slots - Monster Hunter: World - GameFAQs
Here's a complete list of MHW Iceborne augment materials.
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Augment Slot is a gem socket on certain named or random items. By adding an augment into a slot, your item gains an additional effect, as long as the augment is slotted.