KD8 Charges are a type of terran demolition device. They were utilized by reapers after the removal of the deuterium-eight charge from their arsenal, and are used to both deal damage and displace enemies.
Explodes after a short delay, dealing 10 damage and knocking back nearby units.
After deuterium-eight charges were removed, renegade reaper squadrons began using modified versions of the charges. It is heavily implied that Kd8 charges are those explosives.