Due to the limited range of i-0's compact flamer it was decided to give the poor little servo-skull an optional upgrade should his master require some more long-range firepower while treating wounded battle brothers. That was anything but an easy task as servo-skulls cannot copw with the recoil of basically anything bigger than s pistol, but fortunately the adeptis mechanicus (almost) always has some pattern deep down there in its archives to get the job done. In this case, it is the pattern for a disposable (albeint potentially reloadable if given enough time) twin-tube missile launcher that had been developed over ten millenia ago to provide space marines additional firepower without taking their bolters away. The Ryza pattern disposable missile launcher was supposed to be strapped to the arm of a space marine like a combat shield, and it was linked directly to the operator's auto-senses. When required, the space marine could fire one or both missiles in rapid succession and then immediately ditch the launcher from his arm to continue fighting as normal. The pattern was fully tested with satisfactory results, but it never went into production, and the project went to the archives as usual.

Usually loaded with two krak missiles to be used against armored foes or vehicles, the launcher gives i-0 quite an edge when keeping tough enemies at a safe distance: there's very little which can survive a direct hit from a krak warhead, let alone two of them. Another possibility would be a loadout with two plasma missiles, but those guys are pretty rare and there needs to be a generous astartes around who's willing to donate one or two of them to a poor servo-skull that wants to protect his master. Given the job of a wolf priest, though, any astartes providing fire support with his missile launcher will happily do so.