To get Flame Breathing V2 (often called Flame V2) in Weak Legacy 2 , you need to meet several progression, item, and quest requirements, then complete a short PvP-style task.

Core requirements

You must first set up your character and breathing before the Flame V2 quest even becomes available.

  • Have Flame Breathing V1 unlocked and leveled to 200 Mastery.
  • Reach at least Level 15 on your character.
  • Have about 1,000,000 Yen saved up for the upgrade cost.
  • Farm 10 Ablaze Spirits from the Mugen Train event or raid.
  • Farm 2 Crystal Essences , also from Mugen Train.

Some guides also note that having the Rengoku clan is required for Flame V2 , similar to other V2 breathing upgrades, so you may need to roll for Rengoku before progressing.

How to start the Flame V2 quest

Once you meet the prerequisites, you can actually begin the upgrade quest.

  • Go to the starting village and talk to the Rengoku NPC (in front of or near the dojo) to access Flame-related quests.
  • After you have Flame V1 Mastery 200, the necessary Yen, and the required drops (Ablaze Spirits and Crystal Essences), a Flame V2-specific quest becomes available.
  • Make sure you are in a public server , since some quest objectives do not count in private servers.

If the quest does not appear, double-check that your mastery, level, Yen, and items match the current patch’s requirements, since numbers can change slightly with updates.

Quest objectives and final unlock

The Flame V2 quest is short but can be demanding, especially if you are still on V1.

  • After accepting the Flame V2 quest from Rengoku, you typically need to defeat two demon players in a public server.
  • These kills must be completed as part of the quest; random kills without the quest active will not count.
  • When the quest objectives are done, talk to Rengoku again to unlock Flame Breathing V2 and gain access to its upgraded forms.

Many players recommend doing this step with friends or a coordinated group to safely secure demon player kills.

Why Flame V2 is worth it

Flame V2 is currently considered one of the strongest and most meta breathings in Weak Legacy 2, making the grind very rewarding.

  • Offers high burst damage , strong burn-over-time , and good combo potential in both PvE and PvP.
  • Synergizes especially well with the Rengoku clan , which can boost damage and sometimes unlock extra potential for the final form.
  • The newer update around late 2025 made Flame Breathing V2 a central part of the game’s endgame and “best breathing” discussions.

TL;DR: Get Flame V1 to Mastery 200, reach Level 15, farm 10 Ablaze Spirits and 2 Crystal Essences from Mugen Train, save 1M Yen (ideally with Rengoku clan), then accept Rengoku’s Flame V2 quest in a public server and finish the demon player kills to unlock it.

Information gathered from public forums or data available on the internet and portrayed here.