Diablo IV: How to Get Blood Moon Breeches – Best Farm

Blood Moon Breeches has no quest, no reputation track, and no guaranteed unlock. In Diablo IV, it is a Necromancer-only Ancestral Unique pants that drops from the endgame loot pool, so the fastest way to land it is to farm high Torment content quickly and feed boss echoes into Duriel, King of Maggots, the confirmed target-farm source. If you searched for the item under its French name, Jambières de la lune de sang, it is the same piece of gear.

The short version

• What it is: Necromancer-only Ancestral Unique pants, required level in the mid-to-upper 70s (73 on a typical Ancestral roll, 78 at 800 Item Power).
• What it does: your Summoning Skills get a 7–10% chance to inflict Decrepify or Iron Maiden, and you deal 50–60% increased Critical Strike Damage to cursed enemies.
• Best target farm: Duriel, King of Maggots (confirmed). Andariel, Maiden of Anguish is a second documented source.
• Faster guaranteed-ish route: use the Horadric Cube “Upgrade to Unique” recipe on white pants with Primordial Dust — it rolls a random Necromancer unique pants, Blood Moon Breeches included.
• General drops: any high-Torment activity — Nightmare Dungeons, Helltides, Legion events, World Bosses.

What Blood Moon Breeches actually does

This is not a generic survivability slot. Its identity is curse-driven summon support. The unique effect gives your Summoning Skills a 7–10% chance to randomly inflict Decrepify or Iron Maiden, and crucially, curses now apply from all of your Summoning Skills, not just minion attacks. On top of that, you deal 50–60% increased Critical Strike Damage to enemies affected by your Curses. In plain terms: your army spreads curses for you, and your crits hit harder against everything it touches.

The inherent affixes lean straight into that fantasy. A current roll carries +9–11% Critical Strike Chance, +2–3 Curse Skill Ranks, +1–2 Golem Mastery, and +1–2 Hellbent Commander. That stat line makes it a clear chase item for minion-heavy, curse-based Necromancers and a weak pick for anything else. If you run a direct-cast or sacrifice build with few minions, this is not your pants slot — see our Lord of Hatred Necromancer build for a setup that actually uses it.

The percentage ranges shift between patches, so trust your in-game tooltip for exact numbers. The mechanics above are stable across every current database.

The best farming method

Step 1: Farm it as an endgame Unique, not a special unlock

Blood Moon Breeches drops from the normal Unique pool, and Ancestral Uniques only appear in high-tier endgame content. Get into Torment-level difficulty first. If you are still below that threshold, stop hunting the pants and build a stable farming loop instead.

The biggest mistake here is pushing a difficulty that makes every run slow. Unique hunting is a volume problem. Ten clean runs at a Torment you finish fast beat three painful runs at a higher tier where you spend half your time kiting elites. Kill speed wins.

Step 2: Use Duriel as your primary boss target

If you want one named source, use Duriel, King of Maggots. He is the most consistently confirmed target-farm source for Blood Moon Breeches across databases. Andariel, Maiden of Anguish is a second documented source, so if you have materials for both, run both — but treat Duriel as the priority.

Structure your session around feeding summoning materials into repeated boss kills. Boss echoes turn your time into concentrated high-value drops instead of hoping a random chest hits the right Unique pool. If your build shreds single targets, lean hard into this. If you clear packs better than bosses, spend the first half of the session farming materials, then commit them in one block of repeated summons. Our best Duriel farm route applies here too — the same loop feeds both items.

Step 3: Craft it in the Horadric Cube

The Lord of Hatred crafting system gives you a real shortcut. The Horadric Cube’s “Upgrade to Unique” recipe takes a common (white) pants base and Primordial Dust and outputs a random unique pants of the same type — and Blood Moon Breeches is in the Necromancer pants pool. It is not a guaranteed target craft; every attempt is an RNG roll within the category. But if you are sitting on spare dust, it is faster than waiting on a drop. Full recipe details are in our Horadric Cube recipes guide.

Step 4: Fill the gaps with high-density loot activities

When you have no boss materials and no dust, switch to content that generates the most item rolls per minute. Blood Moon Breeches can drop from any high-Torment source, so favor dense enemies and frequent rewards:

• Helltides: compress many chest openings into one session and feed crafting and boss progression at the same time.
• Nightmare Dungeons: steady elite density and fast repeatability if you can clear the layout quickly.
• Legion events and World Bosses: high-value drops with no long commitment — run them when the timer lines up.
• Obol gambling: spend Obols at the Purveyor of Curiosities on pants as a side lane, not your main plan.

A one-session route that wastes the least time

• Start with whatever high-density event is active — Helltide or a fast Nightmare Dungeon chain.
• Pick up every summoning material that feeds Duriel or Andariel instead of tunneling random elites.
• Slot in World Bosses or Legion events only when they line up with your timer; do not idle in town.
• Once you have enough materials, spend them in a block of repeated Duriel runs, not one at a time between chores.
• Burn spare Primordial Dust on Horadric Cube pants rolls and dump leftover Obols at the end for extra chances.

This stacks two goals at once: you are always generating general Unique rolls while building toward the most reliable named target-farm lane. That beats grinding one dungeon for hours and hoping the pants appear.

Is it worth equipping?

Do not auto-equip it just because it is orange. Blood Moon Breeches gives up a custom pants slot, so it has to earn the space. It is strongest when your Necromancer already runs Skeletal Warriors, Mages, and a Golem, wants curses active constantly, and benefits from Curse ranks, Golem Mastery, and Hellbent Commander scaling. In that build it saves you manual curse casts and raises uptime on curse-based synergies.

If your build is mostly direct-cast damage with minimal minions, the curse proc rarely fires and the pants lose most of their value. Chase this for a summoner Necromancer, full stop.

Common mistakes

• Farming content you cannot clear smoothly. This is a rare Unique already; slow clears make the chase feel far worse than it is.
• Ignoring the level requirement. It needs the mid-to-upper 70s (73 on a typical roll, up to 78 at 800 Item Power). If it drops early, stash it and plan around the requirement.
• Equipping it on the wrong build. Without an active minion package, the curse proc barely triggers and you lose a stronger custom pants roll.
• Expecting a guaranteed Horadric Cube craft. “Upgrade to Unique” rolls a random pants unique, not Blood Moon Breeches specifically — budget your Primordial Dust accordingly.

Practical takeaway

Farm Blood Moon Breeches like any high-value endgame Necromancer Unique: stay in Torment content you can clear fast, feed boss echoes into Duriel, King of Maggots (with Andariel as a backup), and burn spare Primordial Dust on Horadric Cube pants rolls. Then only commit it to your build if your Necromancer is genuinely built around minions and curses — that is the only profile where its 7–10% curse proc and 50–60% crit-against-cursed bonus actually pay off.