Spirit Warriors Thousand Sons Space Marines have the same vulnerabilities and immunities as daemons but do not get the unmodified daemonic aura save and must use their power armour saving throw instead.
In addition, each time the warp card Energry Drain is played the Chaos player must choose D6 of the Thousand Sons to remove as casualties
Immune to Psychology Immune to all psychology. Cannot be affected by fear, terror, or any of the psychological factors in the Warhammer rulebook. They can also never be Broken