GTA Online's holiday event kicks off in full today, as a rare weather event--snow--begins to fall in the world now through Monday to celebrate the holidays, Rockstar Games announced on its blog.

A new Adversary mode has also been released. Titled Juggernaut, this is an "all-out brawl for dominance," with two players suiting up with heavy armor and a chaingun to become a behemoth.

"In this brutal war between two opposing teams, the Juggernaut is your greatest asset and your only liability," reads a line from its description." As an Attacker, you'll need to flank, swarm and successfully execute the opposing team's heavily-reinforced Juggernaut--while protecting your own--to take the win. If your team is unable to wipe out the opposition's Juggernaut in time, Sudden Death rules go into effect and everyone becomes a Juggernaut. First kill wins though, so you'll want to be aggressive in trying to take first blood.

You can earn doubled GTA$ and RP in the mode now through January 1.

More holiday-themed content has now arrived as well in the form of a custom version of the Pfister Comet that's been morphed into a "gritty urban dragster suitable for the rough-riding drifters of Los Santos." You can find the vehicle at Benny's Original Motor Works.

As mentioned, snow is now falling in Los Santos and Blaine County, continuing through December 26. Also, snowball fights are back. You can press left on the D-pad to collect up to nine snowballs

Additionally, Rockstar announced some holiday presents for GTA Online. Everyone who logs in on Christmas Day (December 25) will receive a unicorn mask (see it below) and some pajamas, either the White Graphic or Blue Check items. Players also receive the following ammunition for loggin in:

Fireworks Launcher plus 10 Fireworks rockets

Carbine Rifle plus 200 rounds of Ammo

Marksman Rifle plus 200 rounds of Ammo

Basic Knuckle Dusters

25 Sticky Bombs

25 Grenades

5 Proximity Mines

5 Molotovs

Full Snacks

Full Armor

You don't have to wait until Christmas to get a gift in GTA Online, however, as Rockstar said people who log in December 23, 24, or 26 will get the Fireworks Launcher and 10 rockets, as well as a t-shirt.

Lastly, Rockstar announced a bonus for select criminal activities; on December 24 and 25 only, you can earn 50% more from the list below:

50% more GTA$ on all Vehicle Exports

50% more GTA$ on all Biker Business Sales

50% more GTA$ on all Special Cargo Deliveries

For more on how other games are celebrating the holidays, check out GameSpot's roundup.