And They Shall Know No Fear Space Marines automatically pass Morale tests to regroup, and can take such tests even if the squad has been reduced to less than 50% by casualties, though all other criteria apply. If Space Marines are caught by a sweeping advance, they are not destroyed and will instead continue to fight normally. If this happens, then the unit is subject to the No Retreat! rule in this round of close combat and may therefore lose additional casualties if outnumbered. Usually troops that regroup may not move normally and always count as moving whether they do or not, but these restrictions do not apply to models with this special rule.
Units that include Servitors and Familiars are still subject to this rule as long as the unit contains at least one Space Marine.
Space Marines are still subject to Last Man Standing tests. They will always regroup after each Fall Back move to 'reassess' the situation however.
Psyker In order to use one of his powers, a Psyker must make a Psychic test by rolling equal to or under his Leadership on 2D6. If he fails, then his concentration is broken and he cannot use the power that turn. A pass means the power me be used as described in the special rules for the Psyker in his Codex.
Unless specified otherwise, psychic abilities are subject to the usual Shooting rules, so the Psyker must be able to see the target, all attacks must be directed against a single target unit, etc. While most psychic powers are used instead of shooting, there are a number of psychic abilities that may take effect in other phases.
If a Psyker rolls a 2 or 12 when making their Psychic test, the Psyker is subject to Perils of the Warp - he suffers one automatic hit at Strength 6 with no saves (of any sort) allowed. Note that on a Psychic test roll of a 2 the psychic power still works, even though the Psyker has been attacked or killed.
