In order to enter real space in greater numbers Daemons need to use Warp rifts. These are breaches in the fabric of reality that can vary in nature and size. At times a Daemon can possess a mortal and turn him into a portal through which whole hosts can pass. These daemonic incursions are followed by maelstroms of warp energy and can taint real space severely, often twisting and reshaping whole planets until they are lost and turned into [[Daemon World]]s.{{Fn|7}}{{Fn|4242a}} This is worsened by the fact that the aforementioned warp energy will provoke primal terror in even the most emotionless warriors.{{Fn|4242a}} It is not surprising that the [[Imperium]]'s [[Ordo Malleus|Daemonhunter]]s are granted unlimited resources to deal with such threats.{{Fn|5}}

Daemons occasionally form together into groups, alliances, pacts, or covens known as warbands. The constant shifting loyalties of the Chaos gods means that no two invasions into real space are ever the same, and the Imperium has no reliable way of identifying warbands as survivors of such Daemon attacks are often rendered insane or the [[Inquisition]] is forced to sanction them.{{Fn|9}} Daemons may also accompany the most favoured servants of chaos to war.{{Fn|42b}}

*{{Endn|42}}: [https://web.archive.org/web/20251210114740/https://assets.warhammer-community.com/eng_10-12_wh40k_faction_pack_chaos_daemons-o4zman18oy-fz13htfitp.pdf Faction Pack: Chaos Daemons], pg. 2 ''(saved archive page, dated 10 December 2025, last accessed 12 December 2025, original link: https://assets.warhammer-community.com/eng_10-12_wh40k_faction_pack_chaos_daemons-o4zman18oy-fz13htfitp.pdf)''**{{Endn|42a}}: pg. 2**{{Endn|42b}}: pg. 3