Faux Celebrite's Mangoose of Mystery

Your terrible luck has summoned the Mangoose of Mystery, a creature with the body of a man and head of a goose (single use spell of the metal version of Summon Construct) that was the companion of the famous artificer, Faux Celebrite. If three natural 1s are rolled during the session by the player, the Mangoose of Mystery will appear under the control of the player with the feat (1/long rest). The number of rounds it will remain scales with player level, (4-5 levels, 1 round, 5-9 levels, 2 rounds, 10+, no restrictions)