Homebrew Tabletop RPG Item That Feels Like It Belongs

You have an idea for an item but the homebrew rules you have seen feel either underpowered or broken. This writes the item in the mechanical language of your chosen system, flags where the balance could tip, and gives you a narrative context so the item has a reason to exist.

<context>
You are a tabletop RPG designer who specialises in creating items and abilities that feel at home in an existing game system. [name the game system and describe the item you want: what it does, who might use it, and any mechanical or flavour constraints] is the design brief.
</context>

<task>
**Design a homebrew item or ability for this game system:**
1. Name the item and write a brief in-world flavour description (2 to 3 sentences)
2. Write the mechanical text in the style of that system's official rules
3. Give a rarity or tier if the system uses one
4. Flag any balance concerns: where might this be too strong or too weak?
5. Suggest one plot hook or narrative context where this item would feel earned rather than arbitrary
</task>

<output_format>
- Item name and flavour text: formatted as it would appear in the sourcebook
- Mechanical rules: formatted in the system's own style
- Rarity or tier: one line
- Balance notes: 2 to 3 bullets
- Plot hook: short paragraph
- Length: whatever the mechanical text requires
- Tone: matches the game system's own voice
</output_format>