Mythic+ keys — how they work, difficulty and loot

Mythic+ is a keystone mode for Wrath 5-player dungeons. Buy a key from the Mythic Plus Master, enter a dungeon, and have the party leader use the keystone inside. The run becomes Mythic+, affixes apply, and the timer starts. Each death adds 15 seconds. Beat the timer for rewards. Overtime still lets you finish, but that run pays no gold, emblems, or chest.

A timed full clear upgrades your personal key by exactly +1, up to +15. You can start any key from +1 up to the key you currently hold.

Easy keys are +1 through +8. Their gear stops at ilvl 226, under the 232–236 band, and the health and damage on those keys are low so any group can clear them calmly. +9 is ilvl 239 and stays hard. +10 through +15 keep climbing.

Difficulty on the easy band (trash HP / boss HP / damage / extra enemies): +1 — +5% / +3% / +8% / +0%. Lightning. +2 — +8% / +5% / +12% / +0%. Lightning, Bolstering. +3 — +12% / +8% / +16% / +5%. Enrage, Bolstering. +4 — +16% / +10% / +20% / +5%. Roots, Bolstering, Sanguine. +5 — +20% / +14% / +25% / +8%. Explode, lightning, Bolstering, Sanguine. +6 — +25% / +18% / +30% / +10%. Enrage, Bolstering, Sanguine. +7 — +32% / +22% / +38% / +12%. Lightning, roots, Bolstering, Sanguine, Explosive. +8 — +40% / +28% / +48% / +15%. Explode, Bolstering, Sanguine, Explosive.

From +9 the old ramp returns: +9 is +140% trash HP and +140% damage, and +15 reaches +400% trash HP and +410% damage. Bolstering starts at +2, Sanguine at +4, Explosive orbs at +7, Necrotic at +10.

Loot +1 — no gear chest. Emblems only. +2 to +7 — one dungeon item per map per UTC day, from that dungeons heroic pool at the key ilvl. A higher timed key on the same map upgrades the chest until you claim it. +8 to +15 — one raid item per character per week (Wednesday 05:00 Kyiv). The chest uses the highest timed +8 or above that week.

Item level: +2 — 187, normal 5-player. +3 — 193, pre-heroic. +4 — 200, heroic / Naxx-10. +5 — 207, strong heroic. +6 — 213, Naxx-25. +7 — 219, Ulduar-10. +8 — 226, Ulduar-25. Last easy key. +9 — 239, Ulduar-25H. +10 — 245, ToC-25. +11 — 258, ToGC-25. +12 — 264, ICC-25. +13 — 271, upper ICC-25. +14 — 277, ICC-25H. +15 — 284, ICC-25H / Ruby Sanctum.

Emblems still drop on every timed clear: +1 gets 2 Emblems of Heroism, and the stack climbs to 8 Emblems of Frost on +15.

Gold is one purse per character per UTC day, from the highest timed +2 or above that day. +1 pays no gold. A higher key later the same day pays only the difference. The amounts are one third of the old purse: +2 — 166g, +3 — 216g, +4 — 283g, +5 — 333g, +6 — 400g, +7 — 466g, +8 — 533g, +9 — 600g, +10 — 666g, +11 — 733g, +12 — 800g, +13 — 866g, +14 — 933g, +15 — 1000g.

Claim chests with .mplusclaim or the Vault tab in IceDNiccoMPlus. The same tab lists this difficulty scale.