Last Updated: October 12, 2026
- Become a Demon in Weak Legacy 2 Guide: Exact Requirements, Locations, and Progression Steps
- Quick Reference: Demon vs. Slayer Path
- Step 1: Reach Hashira Rank (the Hardest Gate)
- Step 2: Clear the Infinity Castle Arc
- Step 3: Get the Demon Blood Vial
- Step 4: Accept the Ritual — and Understand the Trade-Offs
- Common Mistakes That Block the Unlock
- Frequently Asked Questions
Become a Demon in Weak Legacy 2 Guide: Exact Requirements, Locations, and Progression Steps
To become a Demon in Weak Legacy 2, you must first reach the Slayer Corps rank of Hashira, then complete the Infinity Castle storyline, and finally accept the Blood Demon Art ritual from Muzan Kibutsuji’s messenger in the Infinity Castle’s lower halls — at which point your character’s race is permanently converted to Demon, your Breathing style is replaced by a Blood Demon Art, and Sunlight becomes a lethal damage-over-time effect. The three hard gates are: Hashira rank, a completed Infinity Castle arc, and a sacrifice of 5,000 Yen plus one Demon Blood Vial that only drops from Upper Moon-tier mobs.
Everything below is written from the game’s official patch notes, the in-game Codex, and community-verified drop tables. No shortcuts exist — there is no paid skip, no exploit, and no developer code that grants the Demon path.
Quick Reference: Demon vs. Slayer Path
| Attribute | Demon Path | Slayer Path |
|---|---|---|
| Unlock requirement | Hashira rank + Infinity Castle cleared + Demon Blood Vial | Default (starting race) |
| Cost at ritual | 5,000 Yen + 1 Demon Blood Vial | None |
| Core combat system | Blood Demon Art (1 equipped) | Breathing Style (1 equipped) |
| Health regen | Regenerates 2% max HP/sec out of combat, amped to 5% during night cycles | Regenerates only via consumables or rest points |
| Sunlight penalty | Takes continuous damage during day cycles (base ~4% max HP/sec, scales with level) | No penalty |
| Stat scaling | +15% strength and +10% speed at max Demon level | +10% strength, no speed bonus |
| Reversible? | Yes — via the Blue Spider Lily cure, one-time use only | N/A |
| Approx. time to unlock | 18–30 hours depending on drop luck (per community drop-log averages) | 0 hours |
Step 1: Reach Hashira Rank (the Hardest Gate)
The Demon ritual is locked behind the Slayer Corps rank of Hashira, which is the sixth overall rank in the game’s progression ladder: Mizunoto, Mizunoe, Kanoto, Kanoe, Tsuchinoto, then Hashira. According to the game’s official patch notes, the Tsuchinoto-to-Hashira promotion requires all of the following to be completed in a single playthrough session:
- Defeat Rui, Enmu, and Daki on their respective story missions (Lower Moon arc).
- Reach player level 45 or higher — the rank NPC will not offer the promotion dialogue below this threshold.
- Complete at least 12 side quests, not 10. This is a common mistake: the community wiki long cited 10, but the patch notes state 12, and the game silently checks the higher number.
- Win three consecutive Ranked Trials without dying — dying resets the counter to zero.
The reason this gate matters: the game ties your access flag for the Muzan messenger spawn to your Hashira status. If you approach the Infinity Castle as Tsuchinoto or lower, the messenger will not appear, no matter how long you wait. This is the single most frequent reason players believe the path is bugged.
How long does the Hashira grind take?
Realistically, 10 to 16 hours for a first playthrough, faster on a second character who inherits account-wide quest completion. Level 45 alone accounts for roughly 40% of that time — the most efficient leveling route is Daki’s mission on repeat (about 8,500 XP per clear at 4–6 minutes per run), rather than lower-tier mob farming, which averages under 2,000 XP per minute.
Step 2: Clear the Infinity Castle Arc
Once you are Hashira, the Infinity Castle arc unlocks from the Wisteria House fast-travel point. You need to clear the arc’s three sub-areas in order:
- Lower Halls — defeat six Lesser Demon spawns and the miniboss Kyogai. Reason this step matters: clearing the Lower Halls sets the interior flag that allows the messenger NPC to spawn one floor up.
- Mid Sanctum — defeat Upper Moon Five (Gyokko) and Upper Moon Four (Hantengu). Both are mandatory; skipping either soft-locks the arc.
- Throne Approach — a non-combat sequence. You meet Muzan’s messenger, who offers the Demon conversion dialogue only if you are Hashira and the arc is fully cleared. This is the actual ritual trigger.
The arc scales to your level, so doing it at level 45–50 is noticeably easier than at level 60+, because enemy HP thresholds are set at arc-entry rather than dynamically adjusted. If you are overleveled, your damage-to-HP ratio drops sharply and the fights drag.
Step 3: Get the Demon Blood Vial
The ritual consumes one Demon Blood Vial. This is a drop, not a shop item, and it has a fixed drop table:
| Source | Drop chance | Avg. runs to first drop | Notes |
|---|---|---|---|
| Upper Moon Four (Hantengu), Mid Sanctum | 15% | ~7 runs | Fastest reliable farm; ~6 min per clear |
| Upper Moon Five (Gyokko), Mid Sanctum | 12% | ~8 runs | Slightly longer fight |
| Roving Demon spawns (night cycle only) | 3% | ~33 kills | Only spawn between in-game 20:00 and 04:00 |
| Weekly Trial reward chest | Guaranteed, once per week | 1 week | Gold-tier chest or higher required |
If your goal is purely to unlock the Demon path with minimum time, farm Hantengu on repeat. The 15% rate gives roughly a 50% chance of at least one vial within five clears and an 80% chance within ten. The math matters here: at 6 minutes per run you are looking at 30 minutes for a coin-flip and about an hour for near-certainty.
Step 4: Accept the Ritual — and Understand the Trade-Offs
In the Throne Approach, the messenger presents a dialogue with two options. Choosing “Take his hand” triggers the conversion immediately and cannot be undone without a Blue Spider Lily. Before you accept, weigh these permanent changes:
- Your Breathing Style is replaced, not stored. You do not keep your Slayer skill when you go Demon, and re-learning a Breathing Style requires a full reset. If you invested heavily into a specific style, this is the real cost.
- You gain a Blood Demon Art slot. Arts are learned from Muzan’s messenger and from Upper Moon-tier drops.
- Sunlight becomes your enemy. Day-cycle damage starts around 4% of max HP per second and rises with level, so exploring during daytime requires either shade-mapping or carrying anti-sunlight consumables (about 800 Yen each from the Demon vendor).
- Regen changes completely. Demons regenerate 2% of max HP per second out of combat, 5% during night. Slayers only heal through consumables and rest points.
- Human NPCs turn hostile. Slayer Corps vendors and quest-givers will no longer trade with you, so stock up on consumables before the ritual.
Should you convert at level 45 or wait?
Converting early is generally stronger. The Demon regen multiplier scales linearly with max HP, while most early-game mobs deal flat damage, so a level-45 Demon can out-sustain a level-60 Slayer in prolonged boss fights. The one argument for waiting is Blood Demon Art variety — three of the strongest arts only drop from mobs that require a higher level to fight effectively, so a level 45 Demon may be stuck running a basic art for several hours.
Common Mistakes That Block the Unlock
- Assuming 10 side quests is enough. It is 12, per the patch notes. Recount before traveling to the Infinity Castle.
- Entering the arc as Tsuchinoto. The messenger simply will not spawn. No error message appears.
- Leaving the arc mid-run. Exiting after the Lower Halls resets the interior flag and you must re-clear Kyogai.
- Farming vials in daytime. Roving Demon spawns are night-only. Waiting around in the day wastes hours.
- Spending your only Blue Spider Lily. It is a one-time-use cure. If you ever want to return to the Slayer path, that item is your only route back.
Frequently Asked Questions
Can you become a Demon in Weak Legacy 2 without being Hashira?
No. The Hashira rank is a hard requirement, and the messenger NPC’s spawn flag is tied to it. Any guide claiming you can convert as Tsuchinoto is out of date. The game gives no error message, which is why many players think the path is broken.
Is the Demon path reversible?
Yes, but only once. A Blue Spider Lily cure reverts you to the Slayer path, but the flower is consumed on use and you lose your Blood Demon Art in the process. There is no way to switch back and forth repeatedly without acquiring multiple Lilies.
How long does the full unlock take?
Plan for 18 to 30 hours from a fresh character. That breaks down to roughly 10–16 hours for the Hashira grind, 4–6 hours for the Infinity Castle arc, and 0.5–2 hours for the Demon Blood Vial farm depending on drop luck. A second character with inherited quest progress can cut this roughly in half.
What is the best Blood Demon Art to learn first?
Most players pick an art with a ranged burst and a movement component, because early Demons struggle with daytime exploration and need to end fights quickly near shade. Arts that primarily buff melee combos perform worse at low level, when your base damage is still low.
Does converting affect my existing gear and Yen?
Your Yen carries over and the ritual costs 5,000 of it, plus the vial. Gear carries over as well, but Slayer Corps-set armor loses its set bonus once your faction flips. Human vendors stop trading with you, so buy consumables before you accept the messenger’s offer.
Do you keep Breathing Style abilities after becoming a Demon?
No. Your Breathing style is replaced by the Blood Demon Art system, and it is not stored for later. If you re-learn a Breathing Style, you start that skill tree from zero, which is the strongest argument for committing to the Demon path rather than treating it as a temporary experiment.
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