From Lexicanum

Rynn's Might was a famous Land Raider tank in the service of the Crimson Fists Chapter. According to the Crimson Fists, the uncrewed Land Raider managed to narrowly survive the rogue missile that destroyed the Chapter's Fortress Monastery in 89.M41. Thereafter, the vehicle's Machine Spirit launched a solo war against a rampaging Ork Warband, and succeeded in killing the Warboss and many of his followers in a single night. Although Rynn's Might did not survive the encounter, it remains a testament to the awesome power of the Land Raider and its Machine Spirit.

Sources

• Codex: Space Marines (5th Edition)