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 potion of the turtle master (0:20) in Minecraft is shown below:
The Potion of the Turtle Master (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 potion gives you the Turtle Master potion effect for 20 seconds. The Turtle Master potion effect gives you Slowness IV and Resistance III.