If anyone has ever wondered why the Kastelan Robots look a bit off compared to the rest of the Admech range, turns out it's because they're a very old design : r/AdeptusMechanicus
Kastelan Robot | Warhammer 40k Wiki | Fandom
Vorax Class Robot - Warhammer 40k - Lexicanum
40K Loremasters: Legio Cybernetica - Masters of Machines - Bell of Lost Souls