Firstborn Tactical Marines are the grizzled veterans of the Adeptus Astartes, forged in the crucible of endless war. Clad in power armor and armed with reliable boltguns, they form the backbone of Space Marine Chapters, executing versatile battlefield roles with discipline and precision. Though overshadowed by the newer Primaris Marines, Firstborn still bring centuries of experience, honor, and unyielding loyalty to the Emperor.

Authors note: my main goal while adapting this kill team from KT21 to KT24 was to keep it as faithful to the original rules as possible. however, some creative liberties had to be made due to the changes in rules and game flow, e.g, how shoot and fight twice changed from tactical ploys to the Astartes rule for space marines, and the change in how equipment worked. these changes also include balance changes made for certain weapons and rules changed from KT21 to KT24, e.g, supercharged plasma changing from piercing 2 to piercing 1, lethal 5+. hopefully you find the changes and additions made are within reason and help make the team more suitable for this edition.