In my last session, I pit my party against a demilich. The demilich has a movement speed like so: “Speed 0 ft., fly 30 ft. (hover)”
During this combat, the party's druid summoned pixies and used one of them to cast Entangle on it. Entangle reads like this:
Grasping weeds and vines sprout from the ground in a 20-foot square starting from a point within range. For the duration, these plants turn the ground in the area into difficult terrain.
A creature in the area when you cast the spell must succeed on a Strength saving throw or be restrained by the entangling plants until the spell ends. A creature restrained by the plants can use its action to make a Strength check against your spell save DC. On a success, it frees itself.
When the spell ends, the conjured plants wilt away.
Can a hovering creature actually be affected by Entangle?
I personally wasn't sold on the idea that a flying/hovering creature could be effected by Entangle's restraining effects. It seems to me that if the plants were capable of growing enough to reach a flying/hovering creature, there wouldn't be much chance to succeed the STR saving throw, as the plants could easily be above the creature's head on all sides.
I let my player have his moment as it didn't much effect many of the demilich's abilities, but I was curious if anyone had some info on this.