Each item in Minecraft has a unique ID assigned to it, known as an item ID, this can be used in commands to spawn the item into the game. The item ID for splash turtle master potion ii (0:20) in Minecraft is shown below:
The Splash Turtle Master Potion II (0:20) item can be spawned in Minecraft with the below command. Cheats must be enabled before this will work.
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This splash potion will give players within proximity of its splash Slowness VI and Resistance IV.