Dimension Dog, Spellbook of the Grammarian (hb)

You coalesce the concept of time and space into a friend shape, a dog. The dog exists in all times and all places before you draw it forth. While solid here he treats you as friend and does your bidding. They are immune to all damage and all conditions. They can, twice during the hour they are here, add or subtract a dimension to a person or object not larger than a 15ft cube. an unwilling creature can resist with a dex save against your spell save dc. The reduction or increase of the number of dimensions in no way effects any characteristics of creature of object limiting/increasing its ability to affect the number of dimensions it is currently residing in. The dog holds the dimensions taken forever, until you instruct it to return it or you die, releasing it back to its original owner 1d4 days after your death. The dog can only hold or have lent out a number of dimensions equal to your intelligence modifier. The dimension added or taken must be asked for the caster. during combat it immediately after your turn. Other than the above abilities and immunities it has the stats of a mastiff.