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

The Great Vault Explained

The Great Vault gives you up to 9 options every week, but you only get to pick one. Doing more content gives you more choices. It doesn't guarantee that any of them will be good.

What you can control is how many slots you unlock, what item level they are, and which loot pools are available to them. The actual items are still random. This guide covers the rules for Midnight Season 2, the correct item levels, and how to check your possible rewards before reset.

How the Great Vault Works

The Vault has three rows. Each row can add three options:

Raid Finder, Normal, Heroic, Mythic, and Lair kills can count for the Raid row. Heroic, Mythic 0, Mythic+, and Timewalking dungeons can count for the Dungeon row. Delves, Prey, zone events, weekly quests, and assignments can count for the World row.

A few rules are worth knowing before we get into item levels:

• You pick one reward total. Nine unlocked slots means nine options for the same weekly pick.
• The 4th and 8th slots use your 4th-best and 8th-best completions. One +10 and seven +2s gives you one +10 reward and two +2 rewards. The order you did them in doesn't matter.
• Raid slot quality and raid loot eligibility are separate. This week's kills decide how many slots you earn and which difficulty drives them. Your boss progress across the whole season decides which raid items can appear.
• Your loot spec filters the result. Set it to the spec you want before you generate the Vault.

Midnight Season 2 Item Levels

Raid slots

Raid Vault rewards now jump tracks. Raid Finder, Normal, and Heroic rewards start on the next track. Standard Mythic rewards skip straight to Myth 6/6.

Completed difficulty	Vault item level	Track
Raid Finder / World Lair	292	Champion 1/6
Normal	305	Hero 1/6
Heroic	318	Myth 1/6
Mythic	335	Myth 6/6
Eligible Mythic Very Rare and final-two-boss items	344	Myth 9/6

The last line is an item exception, not a different slot. A Mythic raid slot can contain a standard 335 item or an eligible 344 item from The Coiled Altar or Ula'tek. You still need that boss's loot unlocked before its items can appear.

This makes Heroic raid Vault slots a much bigger deal than before. A Heroic slot and a +10 dungeon slot both start at 318 Myth 1/6. A standard Mythic raid slot starts at 335 and needs no normal Myth-track upgrades at all.

Dungeon slots

Dungeon rewards use your highest, 4th-highest, and 8th-highest completed dungeon. A depleted Mythic+ still counts as a completion.

Dungeon level	Vault item level	Track
Heroic / Timewalking	289	Veteran 4/6
Mythic 0	302	Champion 4/6
+2 to +3	305	Hero 1/6
+4 to +5	309	Hero 2/6
+6	312	Hero 3/6
+7 to +9	315	Hero 4/6
+10 and up	318	Myth 1/6

World slots

The World row uses the highest, 4th-highest, and 8th-highest qualifying activities in the same way. Basic world activities count at the lowest reward level. Higher Delves and harder Prey raise it.

Delve tier	Vault item level	Track
Tier 1	279	Veteran 1/6
Tier 2	283	Veteran 2/6
Tier 3	286	Veteran 3/6
Tier 4	289	Veteran 4/6
Tier 5	292	Champion 1/6
Tier 6	299	Champion 3/6
Tier 7	302	Champion 4/6
Tier 8 and up	305	Hero 1/6

Tier 8 is the World Vault ceiling. Doing a higher Delve can still matter for other rewards, but it won't push this row above 305 Hero 1/6.

What Can Actually Show Up

Each row has its own loot pool. Running one specific dungeon doesn't target that dungeon's Vault loot.

• Raid slots use loot from bosses you have unlocked at the difficulty driving that slot. Once you kill a later Venomous Abyss boss, its loot and the loot from earlier bosses stay eligible for the rest of the season. You don't need to kill them all again that week. Tidebound Grotto is a separate unlock, so killing Nymrissa adds her loot without pretending she is the ninth Venomous Abyss boss.
• Dungeon slots use the full Midnight Season 2 dungeon pool, regardless of which eligible dungeons you completed.
• World slots use eligible World gear. The full pool isn't the same thing as the loot from one Delve you happened to run.
• Tier can appear in any row. Dungeon and World slots can roll class-set pieces even if you did not raid.

Your weekly activities unlock the slots. They don't let you narrow the Dungeon or World pools by spamming one source.

If Your Vault Is Bad

You are not forced to take a piece of gear. You can choose Thalassian Tokens of Merit instead:

Vault options unlocked	Tokens
1	2
2	4
3 or more	6

Six tokens can buy a Miasmic Jewelbinder for a socket, but that is not the only thing the vendor sells. This is why "take the socket" is too simplistic. Sometimes crests, a Spark, or another vendor reward is better for your character.

Season 2 also adds the Nebulous Voidcore fallback once you have earned at least three Vault options. It gives you another loot roll on eligible Raid, Lair, Mythic+, Bountiful Delve, or Prey rewards. The August 18 NA / August 19 EU Vault was earned from pre-season activity and does not offer the Season 2 Voidcore. The first one is available from the August 25 NA / August 26 EU Vault.

How to Sim Your Great Vault

The Great Vault Simulator now uses this exact Season 2 reward ladder and the slot rules above. Raid and Dungeon rolls use the current seasonal boss and dungeon pools, including 335 and 344 Mythic raid rewards.

Set your class, spec, and loot spec first. Then enter the highest boss you have unlocked on each difficulty, add Tidebound Grotto separately, and set the activity level for each Vault slot. The simulator will show the correct item level and eligible pool before it rolls anything.

The World row is deliberately more limited for now. It shows the correct item levels and eligible tier pieces, but it does not pretend the old Season 1 Delve pool is the Season 2 pool. We'll add the rest once the live pool has been verified.

The odds are still a model. Blizzard doesn't publish every internal roll weight, especially the exact chance for a Dungeon or World slot to turn into tier. Use the simulator to understand the pool and compare outcomes, not as a promise that your real Vault will follow the same streak.

When Should You Pick?

If taking the item now helps you kill the boss you are progressing, take it. Progress today is worth more than a theoretical upgrade after the raid is already over.

If you don't need the power immediately, wait until after reclear and any planned crafting. There is no prize for opening the Vault first thing on reset. Let the rest of your deterministic loot happen, then choose the option that still gives you the most value.

The same applies to tier. Check your Catalyst options and what your raid can still drop before using the Vault pick on a set piece. Sometimes it completes 4pc immediately. Sometimes it replaces an item you could have converted five minutes later.

For organized groups, waiting also gives the raid a cleaner picture of tier breakpoints, duplicate drops, and who still needs what before people lock in their weekly reward. That coordination matters, but it should never hold back a player whose Vault item helps the current progression boss right now.

Vault FAQ

When do Vault options lock in? At the weekly reset: Tuesday for NA and Wednesday for EU. You can claim the reward later, but activities completed after reset count toward the next Vault.

Do keys above +10 improve the Vault? No. +10 and above all give a 318 Myth 1/6 Dungeon option.

Do I need to kill a raid boss every week to keep its loot eligible? No. Boss loot unlocks last for the season. You still need enough raid kills that week to earn the slot at that difficulty.

Can the Great Vault give tier pieces? Yes. Tier can appear in Raid, Dungeon, and World options.

Should I always unlock all 9 slots? No. More options improve your chance of finding something useful, but the time cost can be much bigger than the added value. Unlock the slots that make sense for your goals.