Don’t miss all the new Warhammer 40k rules, detachments, and daily updates for the Grotmas Calendar 2025 that started with Captain Titus.
The Warhammer Grotmas Calendar is back for 2025, and complete with new 40k rules!
And yes, Captain Titus kicked the whole thing off, and things sort of crawled along until they started dropping new Warhammer 40k rules updates.
Let’s break down the new Grotmas Calendar 2025 updates day by day.
Grotmas Calendar 2025 Overview
Updated on December 16th, 2025, by Rob Baer with the latest Grotmas Calendar drop from GW.
GW kicked off the Grotmas calendar 2025 by promising a proper party for both Warhammer 40k and Age of Sigmar players. They teased fresh daily drops like rules, painting guides, early fiction, and whatever chaos Da Red Gobbo refuses to leak.
Grotmas Calendar 2025 Reality Check
When it arrived, the Grotmas Calendar did not exactly stick the landing. Folks expected the old Advent energy where real rules dropped, and everyone mashed refresh like it was Hobby Christmas morning.
Instead, we got AI slop and posts that felt like standard Warhammer Community leftovers dressed in green.
Warhammer Grotmas Calendar Course Correction
Things finally turned around on Day 5 with actual Warhammer 40k rules updates, and the Warhammer Grotmas Calendar finally woke up.
Once GW stopped phoning it in, the event picked up some speed. Now the run towards the final Grotmas Day at least feels worth watching.
Grotmas Calendar 40k Rules Rumors
Looks like the rumor mill was cooking again, and this batch actually has some teeth, as all of these rumored detachments are already confirmed!
From Emperor’s Children strutting in with their Court of the Phoenician to Space Wolves chasing fresh glory with a new saga, the spread hinted at big shake-ups across Marines, Chaos, Guard, and Aeldari.
2025 Grotmas Calendar Updates By Day
December 16th: Nurgle Comes Bearing Gifts
Today’s Grotmas Calendar drops a grim morality tale set in Ghyran that absolutely commits to the bit. Just remember: if you want more or complain too loudly, Grandfather might show up with gifts you really did not want. It is equal parts holiday parable and full-on nightmare fuel.
December 15th: GW Hints at New CSM Minis?
This Grotmas Calendar dropped a cult-focused short story centered on the Eye of Terror, and it goes full ominous mode. Something violent and iron-clad is coming, which feels very interesting when lined up next to the latest Chaos Space Marine rumors.
December 14th: Spearhead Gets Official Doubles Rules
The Grotmas Calendar just dropped something very practical for Age of Sigmar players. The big takeaway is simple: Spearhead now has official Doubles rules, letting four players jump into fast, balanced games together.
December 13th: Grotmas Goes to Fenris
If you want a grim little Grotmas read that absolutely does not pull its punches, today’s calendar drop delivers a Space Wolves short story soaked in ice, blood, and bad decisions.
December 12th: Darkwater Heroes Get Legends AoS Rules
The twelfth day of Grotmas brings Legends rules for Age of Sigmar. The seven characters form the Heroes of the Jade Abbey Regiment of Renown, gaining bonus melee attacks when they stay together, built-in healing each turn, and full AoS rules for all their unique gear.
December 11th: Traitor Legions Painting Guides
The eleventh Grotmas drop finally brings the Traitor Legion painting guide. It is loaded with step-by-step schemes for every Legion that turned renegade, perfect for getting your Sons of Horus green right or splattering up your World Eaters before the holiday snacks disappear.
December 10th: Space Wolves Detachment
The new Space Wolves detachment rewards sharp instincts and punishing counterplay. The whole theme leans into rotating pack buffs, reactive movement tricks, and precision offense, letting your units hit harder, reposition smarter, and turn every fight into a tactical ambush.
December 9th: Emperor’s Children Detachment
If you want a detachment that turns every charge into a full-blown murder performance, the Court of the Phoenician is your flavor. Your units hit harder, cut cleaner, twist morale, and stack sadistic bonuses the moment they crash into fresh targets.
December 8th: Aeldari/Harlequins Detachment
The Serpent’s Brood gives Aeldari Harlequins a wild mix of extra hits, redeploy tricks, and movement shenanigans that make your army feel uncatchable. It is the strongest the clowns have looked in 10th.
December 7th: Blood Angels Detachment
If you are running a pile of Death Company and want a detachment that rewards you for getting wild on the tabletop, this one is your flavor. The whole theme leans into the Red Thirst and Black Rage, so your units hit harder, crack more armor, and even get juicier bonuses when they are battle shocked.
December 6th: Chaos Space Marines Detachment
The new Chaos Space Marine Nightmare Hunt Detachment stacks more ways to trigger Battle shock, slip units back into reserve, or sneak jump leaders into Warp Talons for extra mobility and early board reach. Stratagems pile on more tests and dish out better hits and wounds for Advance and Charge, or Fall Back tricks.
December 5th: Astra Miliatrum Detachement
If you like your Guard tough enough to chew gravel and still bark Orders, the new Grizzled Veterans Detachment is your new toy. Re-roll 1s To Hit into anything on the board means your guns stay hot even when the dice try to betray you, and the boosted version against targets on objectives lets you re-roll 1s To Hit and Wound.
December 4th: A Bone-Chilling Nighthaunt Story
If you want a spooky little stocking stuffer, today’s Grotmas Calendar drops a Nighthaunt story that hits decently hard.
December 3rd: Space Marine Painting Guides
From the Dark Angels’ “mysterious on purpose” armor to the Salamanders’ scorched green vibe, there is a guide to make every Legion pop on the tabletop. If you want your Loyalists looking sharp enough to make Horus squint, this little rundown is worth a peek.
December 2nd: New Helsmiths Goodies
The Grotmas Calendar dropped a fresh batch of Helsmiths of Hashut content, and yes, the whole thing reads like an AI got locked in a forge and told to “sound grumpy and metal.” The big takeaway is simple: the faction finally gets its Scourge of Ghyran rules,
December 1st: The Emperor Protects… and So Does Captain Titus
Day one of the Grotmas calendar dropped a banger of a Warhammer 40k short story. General Strayk and his Guardsmen are barely holding it together as Tyranids tear their world apart, until a single name cuts through the static: Captain Titus. Yep, that Ultramarine.
The Red Gobbo Might Be Wearing AI Art, and It Is Hilarious
Let’s talk about those goggles in the Grotmas Calendar preview. Or, more accurately, the two sets of goggles on the Red Gobbo’s hat in GW’s promo.
Either this grot is rolling into Grotmas with a double dose of night vision, or someone hit “Generate Again” on an AI art prompt and didn’t notice the extra eyeballs.
Very festive, but maybe also very cursed. Very, please don’t tell the Inquisition, especially since no previous miniatures or art sport a double set.
Final Thoughts on Grotmas Calendar 2025
The Grotmas Calendar 2025 edition is chaotic, festive, and probably held together with hot glue and grot magic. Captain Titus showing up on day one is a strong hook for Warhammer 40k fans, and after that, things are sure to keep getting spicy.
Just keep an eye on the art, because if the Red Gobbo sprouts a third set of goggles, we may need to call the Ordo Xenos.
Until then, enjoy the ride. Grotmas has begun.
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Disgusting to think that shilling for a company like that is a thing. That is a VERY disappointing grotmass so far and it does not hold to last year’s at all.
Oh yeah its a big dissappointment like most things GW did this year, yet they are a $6B company now. Not sure how time or money works anymore honestly lol.
First of all, a huge thank you for this very useful article! <3
Then…
I am sincerely disgusted and disappointed to see that 40k will only have 6 detachments, 4 of which are for Space Marines/Chaos Space Marines…
Games Workshop should be ashamed of always showcasing its little blue men; there are a large number of factions, and there always has to be content for the same three factions…
They're going in circles, and the potential use of AI when they have such a huge Income is even more shameful and disgusting.
Glad you liked the article!