The Great Vault Explained: Slots, Loot, and How to Sim Your Vault

The Great Vault Explained

The Great Vault is your weekly loot chest in World of Warcraft. Every week, the content you complete (raid bosses, Mythic+ dungeons, and delves) generates up to 9 item options. After the weekly reset you pick exactly one of them. That single weekly pick is one of the most reliable gear sources in the game, and it's entirely under your control.

This guide covers how the vault works in Midnight Season 1: how to unlock all 9 slots, what item level each slot gives, what can actually show up in them, and how to simulate your vault before reset so you know what to expect.

If you already know the basics and want the hardcore progression strategy (what to do weeks 1 through 3, holding picks, raid vs M+ slot value), read the Vault Min-Max Guide instead.

How the Great Vault Works

The vault has three rows, one per activity type, and each row has three slots:

Hitting a threshold unlocks that slot for the week. Kill 2 raid bosses and your first raid slot is filled; kill 6 and all three are. The same logic applies to dungeons (1, 4, and 8 Mythic+ completions, timed or not) and delves (2, 4, and 8 completions).

A few rules that trip people up:

• You pick one item total, not one per row. Unlocking all 9 slots gives you 9 options for that single pick.
• Quality is set by your weakest qualifying run. Each slot looks at the Nth-best activity that filled it. Your dungeon slot from 4 runs uses your 4th-highest key, not your best one.
• Boss kills count across all three raids. Voidspire, Dreamrift, and March on Quel'Danas kills all add to the same 2/4/6 thresholds.
• If nothing is an upgrade, take the socket. The vault always offers a fallback option that adds a socket to an item, so an unlucky week is never a wasted week.

Item Levels per Slot in Midnight Season 1

Raid slots

Raid vault items scale with two things: the difficulty you killed on and the position of the boss in the raid. Later bosses generate higher-rank vault items on the same difficulty.

Boss position	Normal	Heroic	Mythic
Boss 1 (rank 1/6)	246	259	272
Bosses 2-4 (rank 2/6)	250	263	276
Bosses 5-7 (rank 3/6)	253	266	279
Bosses 8-9 (rank 4/6)	256	269	282

This is why raid slots are so valuable: a Mythic end-boss vault option lands at Myth 4/6 (282), which would cost 60 Myth Dawncrests to upgrade into from a Myth 1/6 item.

Dungeon slots

Mythic+ vault options are flat per key level, and they stop scaling at +10:

Key level	Item level	Track
Mythic 0	256	Champion 4/6
+2 to +3	259	Hero 1/6
+4 to +5	263	Hero 2/6
+6	266	Hero 3/6
+7 to +9	269	Hero 4/6
+10 and up	272	Myth 1/6

World slots (delves)

Delve vault options scale with the delve tier:

Delve tier	Item level	Track
Tier 1	233	Veteran 1/6
Tier 2	237	Veteran 2/6
Tier 3	240	Veteran 3/6
Tier 4	243	Veteran 4/6
Tier 5	246	Champion 1/6
Tier 6	253	Champion 3/6
Tier 7	256	Champion 4/6
Tier 8+	259	Hero 1/6

Tier 8 is the ceiling: 259 Hero 1/6, the same as a +2 dungeon slot. Delve slots matter most in week 1 (before Mythic+ opens) and for players who don't raid Heroic or higher.

What Can Actually Drop

Each slot rolls from a real loot pool, not from your full wishlist:

• Raid slots only offer items from bosses you actually killed that week, at the difficulty driving that slot. If the trinket you want drops from a boss you skipped, it cannot appear.
• Dungeon slots roll from the entire Midnight Season 1 dungeon loot pool, regardless of which dungeons you ran. Vault dungeon slots can also offer tier pieces.
• World slots roll from the delve loot pool, and can also offer tier pieces.

The pools are filtered to your loot specialization, so set it before opening the vault if you play multiple specs.

How to Sim Your Great Vault

You don't have to guess what your vault might hold. The Great Vault Simulator uses the actual Midnight loot tables and the exact slot rules above:

1. Pick your class, spec, and loot spec. The simulator filters every loot pool the same way the game does.
2. Enter your week. Bosses killed per difficulty, Mythic+ runs with key levels, and delve tiers. The 9 slots unlock exactly as they will in-game.
3. Read the odds. For each slot you see every item that can appear, its drop chance, its item level, and its upgrade track. Mark items as wanted and it tells you the chance your vault contains at least one of them.
4. Simulate the open. Roll the vault as many times as you like to get a feel for realistic outcomes, including how often you end up taking the socket.

Two practical uses: check mid-week whether that 8th key or 6th boss kill actually changes your odds enough to be worth the time, and temper your expectations before Wednesday so the socket doesn't feel like a slap.

Vault FAQ

When do vault options lock in? At the weekly reset (Tuesday in NA, Wednesday in EU). Everything you complete before reset generates that week's options; you can open the vault any time during the following week.

Do higher keys give better vault loot? Only up to +10. Past that, the vault option is the same 272 Myth 1/6 item.

Can the Great Vault give tier set pieces? Yes. Raid slots can offer tier from tier bosses you killed, and dungeon and world slots can offer tier pieces directly.

Should I take an item or the socket? Take an item if it's a real upgrade or a tier piece you need. Otherwise the socket is solid value, it's never wasted. The Vault Min-Max Guide covers when holding your pick is worth it.

Do I need to do all 9 activities every week? No. One +10 already gives you a shot at Myth-track loot. The extra slots add options, which mostly means better odds of a wanted item, not better item level.