the invEffect plugin aims to add the ability to make items give
a player potion effects from anywhere within their inventory
it features a controllable refresh period for potion effects, the ability to specify what part of inventory the items have to be in per effect per item (so you can have an item that in the hand give speed and in the off-hand resistance)
it has 4 commands:
/invEffects set [inv/hotbar/hand/offhand/Armor] [effect] [power] - applies the effect to the item in your hand
/invEffects list - lists the effects on the item in your hand
/invEffects remove [inv/hotbar/hand/offhand/Armor] [effect] - removes the effect from the item
/invEffects clear - removes all the effects on the item in your hand
inv/hotbar/hand/offhand/armor specifies where the item has to be in order for the effect to activate
inv: inventory
hotbar: the hotbar (the bottom 9 slots)
hand: in the players hand
offhand: the offhand slot (the other hand)
armor: in one of the players armor slots
it has a single permission to allow all these commands