That rule comes from Tasha's Cauldron of Everything which is compatible with the 2024 update so it's still a valid RAW interpretation according to WOTC.
Glytch @ Glytch @lemmy.world Posts 1Comments 729Joined 1 yr. ago
Glytch @ Glytch @lemmy.world
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If it's large enough to impose disadvantage on a Dex save it's large enough to cast a noticable enough shadow to grant advantage, therefore a flat roll.