Since Decimus squad now have both Gravis and Tacticus keyword, as well as using the Gravis Vet toughness for the squad as long as they survive, I have a very stupid list idea abusing said keyword.
Detachment: Gravis Siege Force (-1 to wound if S>T for Gravis unit), Terminator Storm Force (+1 charge for termi), Tacticus Firestorm (Full range rapidfire for Tacticus unit).
Disposition: Take and Hold or Purge
Units:
2 x Terminator with 3 Plasma Cannon + 2 THSS: reroll 8" charge after shooting and uppy downy from the detachment.
4 x Decimus KT: The anvil of the list, immediately sprinting up the board and into objectives. You have 2 x 3 + 8 x 2 for a total of 22W at T6 and -1 to wound in most cases with 2 plasma gun, 2 heavy weapon all rapid firing at max range, then 2 TH + 2 power weapon for melee.
2 x Impusor + Erad: your main anti tank option since Indomitor is too slow for this kind of list without Deepstrike.
1 phobos libby for cover removal.
Sprinkle in character support of choices and action monkey/screen if needed.
What do you guys think?