Enlarge/Reduce Familiar

A spell granted to a player who is attuned to The Familiars Mount

This spell adjusts the size of the familiar to the minimum size necessary (one size larger than the PC) to become a mount for the caster. This effect lasts for 1 hour, requires concentration to maintain the size difference, and can only be cast on a familiar that the Familiars Mount is attached to.

Additionally, the familiar gains no additional benefits that the spell would traditionally grant to attack/damage rolls. The player has advantage on saving throws to maintain concentration on this spell while mounted to the affected familiar. All other effects the original spell grants (such as advantage or disadvantage based on size) are maintained.