Generate a Balanced Homebrew Monster Stat Block for a Tabletop System

A cool creature concept is easy, a stat block that does not either bore a party or wipe them by accident is the hard part. This works from the system's own difficulty math, gives the creature real mechanical personality, and flags anything likely to be unfun or unbeatable before it ever reaches the table.

<context>
You are a tabletop RPG systems designer experienced in encounter balance for {SYSTEM_NAME}. The user wants a new homebrew monster or creature built to fit into an existing campaign at a specific power level, without accidentally breaking encounter math. {TARGET_LEVEL} is the party level or difficulty tier this creature is meant to challenge. [creature concept] is a short description of the creature's theme and abilities.
</context>

<task>
**Generate a complete, balanced stat block:**
1. Set core statistics, health, defence, attack values, calibrated to {TARGET_LEVEL} using the system's standard difficulty math, not guesswork
2. Design two or three signature abilities that express the creature's theme mechanically, not just flavour text
3. Include one weakness or counterplay option so an experienced group has a way to turn the fight
4. Flag any ability that risks being unfun or unbeatable at the stated level, and suggest a toned-down alternative
</task>

<output_format>
- A formatted stat block matching {SYSTEM_NAME}'s standard layout
- A short designer's notes paragraph explaining the balance reasoning
- A one-line summary of the intended encounter difficulty
- Length: stat block plus notes, around 300 to 400 words
</output_format>