Your Cover Call Isn't a Guess. There's a Line For That.

Cover isn't a vibe check. It's a geometric test with real numbers attached, and it's not just walls and crates. Here's the actual rule, including the part almost nobody applies: your own party blocks shots too.

Most tables treat cover as a vibe check. Is the goblin "kind of behind" that crate? Sure, throw on some cover. Is the wizard "mostly out of the way" behind the bar? Eh, close enough. That's not how the rule actually works, and skipping the real version means half your ranged attacks are landing, or missing, on a guess instead of a number.

Half cover gives +2 to AC and Dexterity saving throws. Three-quarters cover gives +5 to both, and lets the target attempt to Hide even though the attacker technically knows where they are. Total cover means the target can't be targeted at all: no attack roll, no spell, nothing gets through. Those are big swings. A +5 to AC is the difference between a monster that goes down this turn and one that shrugs off three more hits, and most tables apply it about as often as they remember it exists, which is to say rarely and inconsistently.

The rule isn't "behind something." It's a line.

The actual test is geometric: draw a line from a corner of the attacker's space to a corner of the target's space. If every possible line is blocked, that's total cover. If some lines are blocked and at least one gets through, you're looking at half or three-quarters cover depending on how much of the target's space the obstruction eats. It's not "is there a wall nearby," it's "can I trace an unbroken sightline." That distinction matters most at exactly the moment nobody wants to stop and check it, five players deep into a round.

Your own party counts as cover

Here's the part that gets skipped even by tables that do bother with walls and crates: creatures block line of sight too. If your fighter is standing between the enemy archer and your squishy sorcerer, the sorcerer has cover from that archer. Usually that's half cover, sometimes three-quarters if the fighter's a big body filling most of the gap. That's not a corner case, that's every melee scrum in every fight your table runs. The rogue trying to snipe past the frontline, the archer who can't get an angle because the party's own tank is in the way: that's cover working as intended, and it's the rule most groups don't even know is on the books.

None of this is complicated math. It's just fiddly to do by eye, especially in theater-of-mind, and not much easier on a physical grid where nobody wants to grab a ruler mid-fight. It's exactly the kind of check that's easy to get right when the positions are already tracked precisely, which is the whole premise behind keeping combat on a real grid in Virtual Combat Simulator instead of narrating it: the line either clears a corner or it doesn't, and the tool doesn't have to guess.

Next session, before someone rolls a ranged attack at a target standing anywhere near an obstacle or an ally, take the five seconds to actually trace the line instead of eyeballing it. You'll find cover applies more often than your table's been giving it credit for. The fights where a rogue can't get a clean shot past the party's own frontline start feeling like a real tactical problem instead of an oversight nobody wrote down.

Has cover ever saved or ruined a called shot at your table? And be honest: did anyone actually trace the line, or just eyeball it?

Your Cover Call Isn't a Guess. There's a Line For That.