more turtles

Updated to 1.20.6 improved potions:

• potion length of skeleton-, zombie-, and wither master have been increased to regular potion lengths
• lava master now lasts longer(8 min for default potion), and has options for potent(take less damage) or long lasting
• skeleton master now shoots weaker arrows, and has options for potent(stronger arrow) or long lasting
• zombie master has options for potent(more spawns with more iron golem) or long lasting
• wither master has options for potent(more range, higer damage) or long lasting
• ender master has option for longer lasting