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 5,800. This pet was previously unable to become gold until Update 10.
Its rainbow version starts off with 5 times the normal stats with 13,000.