The 11th Edition Cover Rule Just BROKE 40k Math

Added: 2026-05-27

[00:00:02]Everyone's talking about possible points changes and the new detachments for 11th edition, but I think one of the biggest competitive shifts isn't even on the front page.

[00:00:12]It's cover.

[00:00:14]For all of 10th edition, defense lived at the safe step. Armor saves, invulnerable saves, and that's where damage got reduced.

[00:00:22]But based on what we're seeing in 11th, that changes.

[00:00:26]Cover is moving all the way back to the hit roll, which means an enormous amount of the math hammer that competitive players rely on stops working.

[00:00:36]And the why is in the numbers.

[00:00:40]In 10th edition, cover usually meant plus one to your armor save. Simple. And it mattered most against low AP weapons.

[00:00:48]Take a lascannon firing at a terminator.

[00:00:50]AP three doing D6 plus one damage. The terminator has a two plus armor save, but the lascannon strips that. The terminator falls back on a four up invulnerable save.

[00:01:01]Once you're on the invuln, cover doesn't help. You're already there.

[00:01:04]The cover effectively does nothing.

[00:01:07]Now look at 11th.

[00:01:09]Same lascannon, same target, but cover doesn't touch the save anymore. It hits the shooter's accuracy.

[00:01:17]Ballistic skill goes from a three plus to a four plus.

[00:01:21]And that single step cost you an enormous amount of your damage before you ever roll a save.

[00:01:27]That's not a small tweak. That's the entire location of defense moving from one phase of the attack sequence to another.

[00:01:35]Cover moved, the math broke.

[00:01:38]Let's actually run the numbers. Imagine 100 attacks all hitting on three plus.

[00:01:43]That's roughly 67 hits. That's your baseline.

[00:01:47]Now apply cover, -1 to your ballistic skill.

[00:01:51]We go from a three plus to a four plus.

[00:01:55]50 hits. From 67 down to 50, that's a 25% damage loss.

[00:02:02]And we only stacked the one modifier.

[00:02:05]Now, stack a second. Maybe they have stealth.

[00:02:08]4 plus becomes a 5 plus.

[00:02:11]Now, we're at 33 hits. That's a 33% loss from 50 hits.

[00:02:19]And if anything pushes that even further, let's say you started off hitting worse, and now you're hitting on a 6 plus, you're cutting the accuracy almost in half again. From a 5 plus to a 6 plus, you're losing half your damage.

[00:02:36]17 hits out of 100 attacks.

[00:02:39]Look at the shape of this. Accuracy doesn't degrade linearly. It scales.

[00:02:45]One step of cover, 25% less damage. Two steps, half.

[00:02:51]Three steps, and you're basically missing most everything.

[00:02:55]And we haven't even talked about what this does to the units you actually want to remove.

[00:03:02]Which brings us back to elite targets.

[00:03:04]Think about terminators, custodies, or even demon saves, knights, anything that relies on a good strong invulnerable save.

[00:03:14]In 10th edition, when you fired a last cannon into a terminator squad, you were already on the 4 plus invulnerable, and cover basically did nothing. On average, removing a single terminator took about 3.75 last cannon shots.

[00:03:29]In 11th, that same last cannon loses accuracy at the hit step before the invulnerable even matters.

[00:03:36]Average damage per shot drops from 0.8 wounds to 0.6 wounds.

[00:03:45]Now, you need closer to five last cannon shots to remove that same terminator on average.

[00:03:52]That's a meaningful increase in resource cost to kill the same model.

[00:03:57]Anti-tank weapons just got worse against the elite units they were built to delete.

[00:04:03]So, if accuracy is suddenly the new defense, then the weapons that lose the least to accuracy penalties are the ones that get stronger.

[00:04:11]There are clear losers and there are clear winners.

[00:04:14]Lascannons, the math we just ran, they take a real hit. Plasma cannons, similar story.

[00:04:21]They need accuracy to be efficient and accuracy just got harder to come by.

[00:04:27]Multi-meltas, specialist anti-armor that pays a premium for their AP and damage output, now pays an extra tax against any unit standing in cover.

[00:04:37]Now, the winners.

[00:04:38]Torrent weapons, flamers, they don't roll to hit, they auto hit. The cover penalties don't apply to them at all.

[00:04:46]Heavy bolters, AP-1, volume of fire, they used to lose their AP advantage to cover saves. Now, their AP matters more and the target is just harder to hit.

[00:04:59]They get more efficient by comparison.

[00:05:02]And volume light fire in general, mass small arms profiles, when defense moves from the saves to hits, AP-1 and AP-2 weapons stop being invalidated as much by terrain. They become pretty consistent damage in the game.

[00:05:19]When accuracy is the defense, hitting bypasses it. But, the story isn't done.

[00:05:26]There's another layer. One of the rumored hidden rules involves a 15-in restriction on targeting units in cover.

[00:05:35]Picture a tactical map. Your unit holds a ruin. Enemy shooters are scattered around the table.

[00:05:42]In 10th edition, they all have line of sight, they all shoot, you eat the damage.

[00:05:47]But now, if this rule is anything close to accurate, without knowing the other rules that could affect it, those shooters can't engage you at all beyond 15 in. Their their firing solutions disappear.

[00:05:59]Their long-range threat goes to zero.

[00:06:01]Combine that with accuracy penalties we just talked about and durable units in cover could survive substantially longer than competitive players are currently used to.

[00:06:12]Now layer everything together.

[00:06:14]Your weapon hits on a three plus, you're at a 66% accuracy, full damage output.

[00:06:20]The target is in cover, -1 ballistic skill.

[00:06:23]Now you're hitting on fours.

[00:06:25]That's 50% accuracy, you lost a quarter of your damage.

[00:06:29]Now imagine unit also has stealth.

[00:06:32]-1 to hit on incoming attacks.

[00:06:35]5+ to hit.

[00:06:37]33% accuracy.

[00:06:39]From your starting baseline, you've lost half of your damage output before saves, before invulnerable, before damage reduction.

[00:06:47]Half. Same weapon, same target, layered modifiers.

[00:06:53]And this is what competitive 40K tends to look like, not one rule in isolation, but several stacking together.

[00:07:00]And here's where things get even more painful because defense doesn't end when the unit takes wounds.

[00:07:07]Take the Scarab Occult Terminators for example. Five model squad.

[00:07:11]Pretty hard to remove all of them for the reasons we just covered.

[00:07:16]You finally commit some resources and you destroy three of them.

[00:07:20]That's three models down.

[00:07:22]Next turn, two of them come back.

[00:07:26]Their unit recovers. The resources you spent mostly undone.

[00:07:31]You spent the equivalent of nine wounds of damage on something the opponent just rebuilt partially almost for free.

[00:07:39]One model is dead.

[00:07:41]Effective trading efficiency, terrible.

[00:07:44]You paid for kills that didn't stick and in competitive 40K, that's the trade math that breaks armies.

[00:07:51]So, when people ask what changes in 11th edition, this is the answer that I'm watching very closely.

[00:07:58]Warrant, stealth, elites, region, range.

[00:08:03]Because this isn't just a balance tweak, it's a structural change to where the defense exists in the attack sequence.

[00:08:10]When defense moves from the save step to the hit step, weapon classes, in one sense, change value. Target priorities can change, the terrain plays differently, math hammer changes.

[00:08:21]If you walked into 11th evaluating units with the 10th edition assumptions, you will get punished.

[00:08:27]What do you think gets stronger when defense moves to the hit roll? Torrent, stealth, elites, regeneration?

[00:08:34]Drop it in the comments.

[00:08:36]Real quick, if any of the math we just walked through is the kind of thing you do at the table, there's a tool I built for it, the Colon Cogitator.

[00:08:45]You can plug in your units, pick your targets, and there'll be toggles for different modifiers.

[00:08:51]Gives you the actual expected damage instantly.

[00:08:55]No spreadsheet, mental math table.

[00:08:58]The models, the math that we just ran, it handles stacked modifier penalties automatically and it's built for 11th edition.

[00:09:06]Coming soon, as soon as I get all the new rules, we'll be adding those to the app. Currently, it's still using 10th edition rules. But as these rules land, calculator will update with them.

[00:09:18]It's a night guys gaming tool.

[00:09:20]Free tier covers some basic list development and the deeper tiers, artificer, antiquity, and legendary, unlock even more features.

[00:09:30]Each one will be adding bigger features to the full army modeling and as you go up, you'll be able to get multi-target trading and strategy comparisons.

[00:09:40]Go check it out at night guys gaming.com >> [music] >> or look at the Patreon to look at joining the beta.

[00:09:46]If competitive 40K analysis is what you want more of, hit subscribe. 11th edition battle reports be coming soon.

[00:09:53]Thanks for watching. I'll see you in the next one.