Using Adversaries in Warhammer 40,000
Including a Greater Daemon as an HQ choice in a non-Chaos army, and the Daemon Pack unit type, are new unit types for use as adversaries to Daemonhunters armies. These units may only be used when fighting against a Daemonhunters army. They are treated exactly as if they were part of the adversary army, although they may not be taken as the compulsory choices from the force organisation chart.
An army intending to fight Daemonhunters in a standard mission could take a Greater Daemon as an additional HQ choice, and Daemon Packs as Troops choices once the compulsory Troops and HQ slots have been filled by choices from their own Codex or army list.
The Daemons that manifest in Daemonhunters games need not be aligned to any of the four major Ruinous Powers, as there are countless Chaos powers inhabiting the Warp. Nonetheless, it is perfectly acceptable to use, for instance, a Lord of Change model to represent your Greater Daemon, or to use any of the lesser Daemons from the Chaos range to represent your Daemon Packs. Players using a Chaos Space Marine army must use the Daemons as listed in Codex: Chaos Space Marines, and may not use these rules. Necron and Tyranid players also cannot use these rules as the concept of Chaos worship is totally alien to these races.
For all those in possession of a copy of Codex: Chaos Space Marines but wishing to take on the Daemonhunters with a non-Chaos army, it is also acceptable for the Greater Daemons and Daemon Packs listed to be used exactly as presented in the Chaos Space Marine army list, including points costs, special abilities and so on. These can be incorporated into the army as HQ and Troops choices as described above.