I would like it if it was made for minecraft 1.11, because that is the version of bukkit I am currently using. If you think this can be done, but you can't add some content into it, please make it without the content. resizer Gives the user an item that puts players back to normal If you want to unshrink prior to the ten minutes of. When you have shrunken, you can walk through one block high holes. Jumping can be a little bit hard at times, but if you jump enough you can usually get up blocks easily. You will then shrink, and the shrinking effect will last for ten minutes. resize (player) Puts the specified player back to normal size How to: To use your shrinking potion, drink it. shrink (player) Shrinks the specified player The advantages to being shrunken is, you could ride on players solders, you could run faster, you could fit through small gaps, you can climb grass, you can (still) climb vines, you can climb moss stone, you can climb leaf blocks, you can run on water for 1 second, you could be harder to spot, and mobs can't detect you as well as normal. The disadvantages is mobs could squish shrunken players, items could do more damage to shrunken players, if a splash potion lands on a shrunken player they take damage, shrunken players couldn't place blocks, shrunken player can only jump onto slabs or stairs, and torches could burn shrunken players. Hide your graphical user interface (GUI). This will be slower than moving on water. Know that you can only get in the boat if you are next to it, not on the slabs. There could be advantages and disadvantages to being shrunk. If you do this on creative you wont die of suffocation. There could also be an item that returns players to normal. Along with admin commands to shrink players. Except, instead of potions, it could be an item that can shrink other players. Essentially its like the Gulliver mod, where players can drink a potion to shrink them self, or shrink other mobs. I have a cool plugin idea, (as you can tell from the tittle) its an idea for a shrink ray plugin.

Minecraft shrink mod 1.12.2