Damn, Tarkus can't use frag grenades while in terminator armor, that sucks. I had just given him the frag grenade usable via energy trait before switching him over! I should have tried this ahead of time!
Also, I think this frag grenade energy trait is worthless. It uses up 75 energy per throw, which is quite a bit considering his victory march trait is persistently draining energy as it is active. Also, supply crates are plentiful on maps so replenishment is easy to find. On my next playthrough I will not be going this route!
Shame about the lack of usable frag grenades for him, but I'll take the 6 times ranged weapon boost I have for him in his terminator armor (215 to 1325) instead!
Having Tarkus, Thaddeus, and Avitus all in terminator armor makes the group of four with the force commander a team to be reckoned with. :lol Too bad the terminator armor destroys all cover around your units if they walk in its direction. Would be nice if the AI pathfinding would be better so they walk around cover than right through it.