What happened to Seh-k'r before his being was split in two, and this part of him arrived on Urrth can be read here:
Odemark Session 1; Wheels Begin to Turn - https://www.worldanvil.com/hero/journal/8238704f-f9c8-4ab3-a3ab-52812e8b53a7/view
Odemark Session 2; Down the Hatch - https://www.worldanvil.com/hero/journal/108b0974-cd9d-47b4-aa66-ac5be31b9b92/view
Odemark Session 3; In the Belly - https://www.worldanvil.com/hero/journal/5535f23f-5bdc-4025-91ff-0278fb9cd3ce/view
Odemark Session 4; More Loot, Less Pillage - https://www.worldanvil.com/hero/journal/5eaf7c06-f30d-432a-9dfc-982db7944a36/view
Odemark Session 5; Out of the Wreck, Into the Ruin - COMING
Odemark Session 6; Underworks - COMING