Bigby's interposing hand

Bigby's interposing hand was an evocation spell that created a hand of force to block a targeted opponent from approaching. Priests who could cast this spell named it for their deity&mdash;Selûne's interposing hand, for example. To Zakharan mages, always reluctant to acknowledge ajami names and accomplishments, the spell was known simply as interposing hand, and counted among the spells of the universal province.

Effects
This spell was one of the Bigby's hand family of spells. It created a hand about the size of an ogre or about 10 ft (3 m) tall with a finger span about the same as the height (earlier versions could be even larger    ) that was placed between the caster and a chosen opponent to gain partial cover from a ranged attack. The hand also slowed the approach of an opponent to half their normal speed if they weighed 2,000 lb (910 kg) or less,    or at least made it difficult to advance if the opponent was stronger than the hand.

All versions of this spell relied on the caster's senses to detect and locate the target, the hand did not have senses of its own,     but once a target was designated the hand would remain interposed regardless of movement by the caster or the opponent and was unfazed by invisibility, darkness, polymorphing, or other means of concealment or disguise. The hand was difficult to injure, but could be destroyed by inflicting damage equivalent to what it would take to kill the caster in prime condition. The hand could be disintegrated or dispelled if it failed to resist such spells.

Range and duration varied widely over the history of this spell. For the earliest versions, a wizard that was just able to learn this spell could maintain the hand for nine minutes and cast it 90 ft (27 m) indoors/90 yd (82 m) outdoors. Later version lasted between 45 seconds and a minute but the reach was extended from 120 ft (37 m) to 190 ft (58 m) at a minimum.

When cast on Avernus, the first layer of the Nine Hells, the hand took on the form of the claw of a fiend.

Components
In addition to verbal and somatic components, this spell required a glove of some sort that varied as reported by different recordings of the spell. The earliest version could use any glove. A later version specified a "soft" glove  and the next version made it a focus instead of a component, so it wasn't consumed in the casting. After the Second Sundering this was refined to a snakeskin glove and additionally required an eggshell (because many types of hand options were combined into one spell).

History
By the 1360s DR Bigby's interposing hand was known but rare among the magical communities of both Faerûn, and Zakhara.