D-9 charges are powerful anti-structure explosives used by Death Head reapers and by Mira's Marauders.
References
Blizzard Entertainment. StarCraft II. (Activision Blizzard) Map: Left 2 Die (in English). 2011.
Blizzard Entertainment. StarCraft II: Legacy of the Void. (Activision Blizzard). PC. Mission: Co-op Missions, Part and Parcel (in English). 2017-11-14.