<effect> element can be used in a kit to apply potion effects directly to a player,
or used to give a custom effect to a potion bottle item.
Duration specifies how long the potion will last, and amplifier determines what level / how strong the potion is.
The effect type is specified by its Minecraft ID.
Effect ID’s should be specified without their
||A potion effect||Status Effect ID|
||Duration of the effect.||Time Period||oo (forever)|
||Strength of the effect. The value matches what is displayed to the player in-game, so the first tier of potions have amplifier 1.||Number||1|
<effect duration="10" amplifier="4">resistance</effect> <effect duration="900" amplifier="1">jump_boost</effect>