Season 1 Reloaded is live in Call of Duty: Black Ops 6 and Warzone, bringing the brand-new Citadelle des Morts Zombies map, Warzone Ranked Play, and more multiplayer maps. This midseason update also includes a new holiday-themed event, which includes the season's new shotgun, multiplayer perk, and weapon attachment, as well as new Zombies items to unlock. Here's how you unlock all rewards for the Merry Mayhem limited-time event.

The Merry Mayhem event is live in Black Ops and Warzone until December 19. Each event item is locked behind an XP milestone, meaning items are earned simply by playing matches of multiplayer, Warzone, and Zombies.

Scoring XP for Merry Mayhem is made easier by playing objective modes, completing challenges of any variety, racking up kills, and achieving wins. Matches of objective-based modes in the small map playlists like Nuketown 24/7 can usually reward the best XP for leveling up and completing events.

There are 10 XP milestones you'll need to reach before unlocking the final Mastery event milestone, which includes the season's new Maelstrom shotgun.

All event challenges and rewards can be seen below.

Holiday Fear - Emblem

This is an undead reindeer emblem that's unlocked at 9,000 XP earned.

Necroclaus - Loading screen

You can get festive with this zombie santa loading screen after you've unlocked it at 21,200 XP earned.

Nasty Nick - Calling card

This is an animated calling card of zombie santa throwing a snowball, it this reward is unlocked at 39,800 XP earned.

Nasty Nick - Calling card

This is an animated calling card of zombie santa throwing a snowball, it this reward is unlocked at 39,800 XP earned.

Light Mend - Zombies ammo mod / Double Weapon XP token

Light Mend is the event's first high-end reward. This is the new ammo mod for Zombies mode, which allows your weapons to deal elemental light damage. Each bullet has a chance to transform a normal or special enemy's health into a healing glyph that moves to nearby injured allies.

This new Light Mend ammo mod is unlocked at 68,000 XP earned.

Likely because this is a Zombies-themed reward, this milestone will also unlock a 30-minute Double Weapon XP token.

Death Claus - Large Decal

The is a large weapon decal featuring zombie santa and his undead reindeer. This reward is unlocked at 109,000 XP earned.

Tesla Storm - Zombies field upgrade / Double XP token

Merry Mayhem adds the season's new field upgrade for Zombies loadouts. This field upgrade works like it did in past Zombies mode, offering the temporary ability to connect lightning to other players, stunning and damaging normal enemies.

The Tesla Storm field upgrade is unlocked at 166,000 XP earned.

Likely because this is a Zombies-themed reward, this milestone will also unlock a 30-minute Double XP token.

Bitter Blizzard - Weapon charm

This adorable yet angry snowball weapon charm is unlocked at 242,200 XP earned.

Shrapnel Radar - Multiplayer perk

The season's new Shrapnel Radar perk will mark injured targets on your minimap if they've received blast damage dealt from your area-of-effect lethals, tacticals, and field upgrades.

The new Shrapnel Radar perk is unlocked at 340,800 XP earned.

Double Battle Pass XP token

This is a 30-minute Double Battle Pass XP token unlocked at 465,000 XP earned.

3-Round Burst - Weapon attachment / Blackcell Drill blueprint

This is a new weapon attachment for Season 1 Reloaded. This 3-burst weapon mod is an attachment specifically for the XM4 assault rifle, which turns the gun's primary firing mode into a three-round burst, helping you to conserve ammo and implement a steadier aim.

This new 3-Round Burst attachment is unlocked at 618,000 XP earned.

Those who own Season 1's pricey Blackcell pass will also unlock an additional reward for this milestone, which is a Blackcell-themed weapon blueprint for the Drill melee weapon.

Maelstrom shotgun

The season's new Maelstrom shotgun is described as being a fully automatic shotgun with good range and handling, but it also has high recoil and wide hip spread.

The Maelstrom is Merry Mayhem's final Mastery reward, and at this time, the challenge doesn't list how much XP you need to earn to unlock this item.