MustaphaTR's D2K mod is a small mod based on original D2K mod of OpenRA. It includes 8 sides (Atreides, Fremen, Ixians, Harkonnen, Corrino, Ordos, Mercenaries, Smugglers) as playable and has special units and abilities for each.
Rocket Strike is Corrino's Ability, it can make maximum of 5 Rocket Turrets able to fire anywhere on the map for 10 seconds, you need to select the target for Turret manually and be quick so it won't degrade. For now AI can't use it. It requires IX Research Center to be built.