The ultimate challenge in Borderlands 2 is Terramorphous, a gigantic thresher. We see some other gigantic threshers around the place, too. In the Pre-Sequel, we learn that threshers (two tiny ones) were introduced to Pandora by Sir Hammerlock, which therefore must have happened between BL1 and BL2 - a five-year period.

So the obvious implication is that Terramorphous is the same as "Terry" from the end of that quest. That means he's had maybe three years to become absolutely ginormous. Is that really how it works? I can't find any information anywhere about the biology of these creatures; probably few people have survived to report on this (other than vault hunters, who are too busy picking over the orange loot).

  • I can't find any information on the lore of threshers - even the NPC's have limited lore except for backstories and what is presented in the games. – FoxMcCloud Aug 9 '18 at 19:59
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    I would wonder if exposure to Eridium or slag has anything to do with his massive growth. – Roijan says reinstate Monica Aug 31 '18 at 2:04
  • Great suggestion @RoijanEskor! In fact, that's highly likely to be it - there's no eridium on Elpis. That makes a lot of sense. Would you like to post that as an answer? It's definitely accept-worthy. – rosuav Aug 31 '18 at 6:24

My best guess is that Terra's massive growth is due to exposure to Eridium or slag.

For example, Bloodwing was exposed to a lot of slag at the Wildlife Exploitation Preserve, and grew very large in a short amount of time.

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