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I was wondering if I could shoot through a large creature like the image below? enter image description here

On the right image, one of the players insists that a large creature shouldn't be able to fill up the 10x10ft space, therefore should still be able to shoot through the large creature (orange) and hit the red for maybe 3/4 cover (+5 AC).

What do you guys think?

Another question would be, can green magic missile red on the right image?

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Yes, you can shoot through a large creature's space to hit the smaller one behind it.*

First of all, let's just clarify what you mean by 'shoot through'. I'm assuming you're asking if you can shoot through the space occupied by the creature, not physically through the creature itself.

To understand the difference, let's look at how size interacts with combat. According to Player's Handbook, Ch 9: Creature Size:

Each creature takes up a different amount of space. The Size Categories table shows how much space a creature of a particular size controls in combat.

According to the provided table, a Medium (you-sized) creature controls a 5' by 5' space during combat. Does that mean that you physically take up an entire 5' square? Of course not.

The same applies to size Large creatures. The table says a size Large creature controls a 10' by 10' square. Take a size Large creature like a Dire Wolf. They're the size of a small horse, yet they still don't physically fill the entirety of the area they control during combat. Sure, it would be harder to hit someone behind them, but that's why there are rules for cover.

So, yes, in both of your diagrams, Green would be able to attack Red, even though Orange is in the way*. Whether you hit or not, well, that's up to the dice!!

Now, for your second question: Even if you can only see the BBEG's finger, you can still Magic Missile them.

Each dart hits a creature of your choice that you can see within range.

No to-hit roll, no credit for cover, as long as you can see them, it's PEW-PEW time.


*The caveat is that there are some creatures, such as the Gelatinous Cube, which actually do take up their entire space...but all of these creatures specifically state that they do so in their description. If Orange was one of these rare cases, then Red would have 100% cover and could not be hit.

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    \$\begingroup\$ Would there be some creatures you might rule differently for? For example, a gelatinous cube, which does fill its entire space? \$\endgroup\$ – Darth Pseudonym Feb 21 at 14:44
  • \$\begingroup\$ @DarthPseudonym: that edge case occurred to me right after I posted. I've updated my answer. \$\endgroup\$ – aaron9eee Feb 21 at 14:46
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    \$\begingroup\$ Gelatinous cubes are also transparent, which might affect how they affect visibility. \$\endgroup\$ – Louis Wasserman Feb 21 at 18:11
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You seem to be able to shoot through a large creature.

The only real guidance the rules (PHB) give us on this is:

A target with half cover has a +2 bonus to AC and Dexterity saving throws. A target has half cover if an obstacle blocks at least half of its body. The obstacle might be a low wall, a large piece of furniture, a narrow tree trunk, or a creature, whether that creature is an enemy or a friend.

(emphasis mine) From that, it seems like creatures provide half cover, no matter what.

Now, the DMG (p251) also mentions cover:

To determine whether a target has cover against an attack or other effect on a grid, choose a corner of the square the attacker occupies or the point of origin of an area of effect. Then trace imaginary lines from that corner to every corner of any one square the target occupies. If one or two of those lines are blocked by an obstacle (including another creature), the target has half cover. If three or four of those lines are blocked but the attack can still physically reach the target (such as when the target is behind an arrow slit), the target has three-quarters cover.

(emphasis mine) which also only calls out half cover for creatures.

All that said:

There's still room for interpretation

You and/or your DM may interpret the rules differently, as the rules don't explicitly say "creatures can (or cannot) provide 3/4 or full cover" and some cases are going to be outside of the generalization of my answer; i.e.- a gargantuan creature laying on the ground would likely provide a solid obstacle to creatures on either side.

Though, if an attacking creature can see at least as well as looking through an arrow slit, no more than 3/4 cover should be offered, as an arrow slit is specifically called out.

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    \$\begingroup\$ It is just calling out the fact that creatures can provide some cover. In each instance, the creatures are in a list with other things that can clearly provide full cover, so it doesn't make sense to assume that they are some sort of exception. However, the other answer notes that *most * creatures don't totally fill in their whole space. Thus, we can conclude that they should provide 3/4 cover, like an arrow slit. \$\endgroup\$ – Zwuwdz Feb 21 at 18:44
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    \$\begingroup\$ I agree with @Zwuwdz. You need to look at it as (1.) what can block? "an obstacle (including another creature)". (2.) how much cover does it give? "If one or two of those lines are blocked [...], the target has half cover. If three or four of those lines are blocked but the attack can still physically reach the target (such as when the target is behind an arrow slit), the target has three-quarters cover." \$\endgroup\$ – Adeptus Feb 24 at 6:04

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