Thanatos XT (MekTek)
This BattleMech was published in an official BattleTech product, namely the MekPak expansion for the MechWarrior IV: Mercenaries computer game. However, although official, computer games are not considered among the sources for Canon unless the information is expressly confirmed as canonical elsewhere.
By virtue of being an official albeit not positively canonical product, the game expansion and the 'Mechs presented therein including this one must be considered apocryphal.
The Thanatos XT is not so much a variant of the Thanatos chassis as a major redesign. The 5XMT variant replaces the MRM-20 launcher with the same lasers located on the 'mech's left arm. Ballistics can also be mounted on this arm.
MechWarrior IV: Mercenaries MekTek MekPak Expansion
- Note: The 5XMT version of the Thanatos came from the variant in the Mektek Mech Pack 2.1a, as well as the NBT Hardcore mod for MechWarrior 4: Mercenaries game.