Solo Boss Monster

To turn a monster of any CR into a Solo Boss monster appropriate for that same CR, simply apply these changes to the monster:

• Increase the monster's HP to its maximum.
• Decrease each of the monster's damage dice down one step: d10s become d8s become d6s become d4s. Keep the same number of dice: 2d10 becomes 2d8.
• The monster acts 4 times per round: at Initiative: Steps 15, 10, 5, and 0.
• At Initiative Steps 15 and 5, the monster takes a full turn (Move, Action, Bonus Action)
• At Initiative Steps 10 and 0, the monster may make either a single attack (its simplest attack action, no multiattack allowed), or a single movement action.
• The monster still only gets one reaction per round.