Mouse DeathBot
From MHWiki
The Mouse DeathBot, often referred to simply as the Deathbot or DB, was the most powerful trap available to hunters in the original Mousehunt rollout on March 7, 2008. As of October 14, 2008, the Deathbot is now the third most powerful trap available to hunters (not factoring in luck or any other bonuses, both positive and negative).
The cost of the Deathbot is 256,400 gold pieces. Additionally, the hunter must have reached a score of 91,000 points to be eligible to purchase the Deathbot.