Bugs & Museum Guide
Fields of Mistria Ancient Firefly Guide
A common Ruins insect. This ancient firefly is almost fairy-like in its appearance.
📊 Ancient Firefly Overview
| Category | Mine bug |
| Location | The Ancient Ruins · Floors 81-99 |
| Spawn Condition | Standard bug spawn |
| Seasons | All |
| Weather | Any |
| Time | 6 AM - 2 AM |
| Rarity | Common |
| Sell Price | 40t |
| Museum | Yes — Ruins |
| Used In | Yes — used in crafting or cooking. |
📍 Where to Catch Ancient Firefly
Ancient Firefly appears in The Ancient Ruins · Floors 81-99 during All in Any weather, from 6 AM - 2 AM.
Catch it with a Bug Net.
🏛️ Museum Donation
Yes — donate one Ancient Firefly to the Ruins set.
🔗 Related Bug Guides
🔎 Sources & Version
Game version: 1.0 · Last updated: 2026-08-13