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The summon fey spell (TCoE, p. 112) summons a fey spirit marked by a chosen mood, which determines the secondary effect of its Fey Step bonus action (after teleporting 30 feet). For the Tricksy mood, the following effect occurs after it teleports:

The fey can fill a 5-foot cube within 5 feet of it with magical darkness, which lasts until the end of its next turn.

Is it possible for the fey to place the 5-ft. cube of darkness over the upper body (mid-torso and up) of an enemy, effectively making any attacker an unseen attacker?

Per the rules on unseen attackers:

When a creature can't see you, you have advantage on attack rolls against it.

If the lower portion of the enemy can still be seen (mid-torso and below), is a character able to target what they can see of the enemy and attack with advantage?

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This requires a DM ruling

The core issue here is whether different parts of the same creature can be considered to be in different lighting conditions. Unfortunately, the rules for vision and light don't seem to provide any clear guidance here, as far as I can tell.

As DM, you might decide that for the sake of simplicity, each creature is considered to be under a single lighting condition, i.e. every creature is either in darkness (i.e. heavily obscured by lighting conditions), dim light (lightly obscured by lighting), or bright light (not obscured), and the mechanical effects of that lighting condition apply equally to all parts of the creature's body. Alternatively, you might decide that the described use of the 5-foot cube of darkness is a clever one and allow the player to use it to cover only the top half of a creature's body.

Personally, I would recommend the first ruling, because of the rules for control of space:

A creature's space is the area in feet that it effectively controls in combat, not an expression of its physical dimensions. A typical Medium creature isn't 5 feet wide, for example, but it does control a space that wide.

If you created a 5-foot cube of darkness that covers a creature from the waist up, the creature could potentially just crouch down in response and see under the cube, while remaining within their 5-foot space. Hence, a static cube floating at waist height might not be effective in blinding the creature, whereas a static cube at ground level would cover the creature's entire space, which unambiguously shrouds the creature's whole body to darkness until they leave that space.

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  • \$\begingroup\$ Not really arguing against this, but: 1) If it covers their head, there's no way for them to know that crouching would help, and 2) If it is set at ground height, most creatures on the taller end of size Medium would just see over it. It's a 5' cube. Your eyes are only a few inches below your height, and aside from Dwarves, most Medium creatures are well above 5' (before we even get into the really tall Medium creatures like Goliaths that would be 2'-3' above the darkness). Seems like you need DM adjudication for it to actually blind anyone anyway. \$\endgroup\$ Feb 18, 2023 at 13:50
  • \$\begingroup\$ @ShadowRanger That's actually a good point. The section on space covers the 2-dimensional space taken up by a creature (e.g. "5 by 5 ft."), but doesn't really cover height. The straightforward way to extend spacing to 3 dimensions is to turn a 5-foot square into a 5-foot cube, but I'm not sure there's any RAW support for that. (This issue arguably deserves its own question.) \$\endgroup\$ Feb 18, 2023 at 14:22

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