A garish fan-gifted saddle that turns Mongo into a rideable mount and buffs Donut's spell damage.
The Enchanted Mongoliensis Saddle arrives in Princess Donut's Platinum fan box on The Iron Tangle — a blue-and-red, tassel-covered horror that magically affixes to Mongo, adjusting to fit a cat rider. It grants Donut +15% offensive spell damage and anti-piercing resistance, and gives Mongo +20% Constitution and +20% melee damage while she's mounted. Despite Mordecai's approval, it takes days of bucking before Mongo tolerates it and a translucent strap appears to hold Donut on, letting her finally begin learning to ride her raptor into battle.
A garish blue-and-red saddle festooned with tassels, little more than a seat and pommel with no reins or straps, that clicks magically onto Mongo's feathered back.
Mount gear enabling Donut to ride Mongo and buffing them both.
Also appears in books you've already read — spoiler-safe to their endings: