Dominus Messor is a rare tier 10 pet that can be found in 2 ways. One way being from the premium shop for 5,999 Robux (No longer available from shop). The second way is by hatching it from a Tier 10 Egg. The chance is 0.1%.
This pet can be made golden to achieve stats of 300 Coin Collection and 5,400 Agility. This pet was previously unable to become gold until Update 10.
Its rainbow version starts off with 5 times the normal stats with 500 Coin Collection and 9000 Agility.