Bosses & Characters

Rengu - Project Slayers 2 Wiki

Rengu's harbor-route location, fight tips, and the Flame Katana drop.

2026/9/25
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Overview

Rengu is unusual because the same character serves two progression roles. He is the Flame Breathing trainer and a boss with a weapon drop, so one route through the harbor district can hand you a style and a katana at the same time. That makes him one of the most efficient stops in the mid game.

His arena sits beyond Mistfall Harbor along the coast road, and the trainer version waits on the Forgotten Ruins rooftop beyond the boss area. If you are working through Flame Breathing, this is the stop where the style actually opens.

Location:Harbor route past Mistfall Harbor
Trainer spot:Forgotten Ruins rooftop
Weapon drop:Flame Katana (5%)
Role:Flame Breathing trainer and boss
Level gate:25
Training material:Demon Horns

Flame Style Run

This run follows the Flame path from an early character through to the hashira fantasy, which mirrors the shape of the Rengu route closely. It is a useful preview of how the style plays before you commit the Demon Horns and Wen, and it makes the training steps easier to recognise once you are standing on the rooftop.

The Harbor Route to Rengu

Start at Mistfall Harbor and head along the coast road rather than cutting inland. The route passes the harbor's shops and quest givers first, then continues past the boss area toward the Forgotten Ruins. Guides describe the trainer as sitting beyond the Rengu boss arena, so the boss is a landmark on the way rather than the final destination.

The rooftop requirement catches people out. Reaching the Forgotten Ruins is only half the job, because Rengu will not start his questline until you satisfy his entry requirements. Arrive with the level and materials in hand or you will be making the same walk twice.

Expect the harbor district to be busy, because Mistfall Harbor is where several early quest givers, a weapon vendor and the coastal route all overlap. Clearing the Flame objectives alongside those errands saves a second journey, and the style overview helps you decide whether Flame suits your build before you invest the Horns.

Flame Training Requirements

Rengu's own gate is lighter than the broad trainer requirements some walkthroughs list for the game as a whole. The table below separates what the Flame route specifically asks for from the general material economy that every style shares, so you can plan the farm properly. The full style overview lives in the breathing styles guide.

RequirementAmountNotes
Character level25Applies to the Flame trainer entry
Demon Horns10Dropped by demon enemies across the map
Training questsFull chainRengu only teaches after you complete them
WeaponA katanaBring a blade to finish the training
Flame Katana5% dropRolled from the Rengu boss encounter
General trainer gateWen and coresOther styles add a fee and Beast Cores
The materials, not the fee, are usually the real barrier, because Demon Horns come from night-time demon kills.

Farming Demon Horns for Rengu

Demon Horns are the bottleneck, so plan a farm before you set off for the rooftop. The cave behind Bamboo Grove's waterfall is repeatedly named as a good spot because it holds demon enemies in a confined space, which keeps respawns quick and makes the loop easy to repeat.

Do the farming at night where possible. Demons are described as night-time drops from caves and the open world, so the same route can also feed an Enmu trip or a Spider Lily run if you are building toward the demon path in parallel.

1

Reach level 25

Level through the harbor quests before you attempt the Flame trainer gate.

2

Farm Demon Horns

Use the cave behind Bamboo Grove's waterfall for a fast respawning demon loop.

3

Travel the coast road

Follow the route past Mistfall Harbor toward the Forgotten Ruins.

4

Climb to the rooftop

Find Rengu above the ruins, not at ground level, and speak to him.

5

Finish the training chain

Complete his quest objectives to unlock Flame Breathing.

6

Farm the Flame Katana

Repeatedly clear the boss encounter for the 5% weapon roll.

Bring Wall Climb and a full stamina bar; the rooftop approach is the part most players underestimate.

Fight Tips and Reward Value

The Rengu encounter is worth more than its drop rate suggests, because it sits on a route you will run for other reasons. The cards below cover why the stop is efficient and what to expect from the fight, and the weapon guide explains where the katana fits afterward.

Burn identity

Flame leans on burn pressure, so expect damage over time rather than burst.

Two rewards

The same route carries the style unlock and the katana drop.

Repeatable roll

The 5% katana can be farmed as often as you can clear the fight.

Milestone stop

Flame is one of eight styles a Slayer character can build around.

Unlock the style first and farm the katana second; the training chain is the part that can be blocked by missing materials.

Rengu Quick Reference

Everything about the Rengu stop fits in one short list. It covers the route, the gate and the reward, and it doubles as a check before you commit an evening to the harbor district. For the wider region, see the world map overview.

  • Boss arena sits past Mistfall Harbor on the coast road
  • The trainer version waits on the Forgotten Ruins rooftop
  • Entry requires level 25 and Demon Horns
  • Training quests must be completed before Flame Breathing unlocks
  • The Flame Katana drops at 5% from the boss encounter
  • The cave behind Bamboo Grove's waterfall is a good Demon Horn farm
FAQ

Frequently Asked Questions

Where is Rengu in Project Slayers 2?

He is on the harbor route past Mistfall Harbor, with the trainer version standing on the Forgotten Ruins rooftop beyond the boss arena.

What level do I need for Rengu?

Level 25 is the listed entry requirement for the Flame trainer, along with Demon Horns and completion of his training questline.

How many Demon Horns does Rengu want?

Published Flame route guides list 10 Demon Horns. Demon enemies drop them, and the cave behind Bamboo Grove's waterfall is a commonly used farm.

What does Rengu drop?

The Flame Katana at a 5% drop rate. It is one of the eight named boss weapons in the game and feeds into later forging.

Is Rengu a boss or a trainer?

Both. He teaches Flame Breathing after his training chain, and he also drops the Flame Katana as a boss encounter.

Do I need a katana for Flame training?

Yes. Bring a blade so you can complete the training objectives, and keep it afterwards if you plan to forge an upgraded version.

How long does the Flame Katana take to drop?

At 5% it can land on the first kill or take dozens. There is no pity system in the published data, so clear speed is the only lever you control.

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