Ok. So here are the suggestions that I've got with regards to the Legiones Astartes rules and the wargear item that I thought of.
Legiones Astartes (Harbingers)
- Legiones Astartes - Units with this special rule may always attempt to regroup regardless of casualties.
- Ascetic Regimen - Models with this special rule must generate psychic powers from the Divination or Fulmination disciplines, and get +1 to manifestation rolls for those disciplines if they have Psychic Focus.
- Samsara - At the beginning of each game roll one dice for each unit with this special rule plus one for each Psychic Mastery level on units with this special rule, each roll of 4+ give the army 1 Samsara. Each point of Samsara may be spent to re-roll a single D6 during the battle. The normal rules regarding re-rolls apply to those granted by Samsara (i.e. you may not re-roll a re-roll).
- Pride of the First: A model with this special rule may not benefit from a special rule, psychic power or the Leadership of a model that does not also have this special rule. [I will add to Icarion’s Sire rule to make sure he counts as a Harbinger for the purposes of this rule]
Unique Wargear - Focusing Crystals
Any character with the Legiones Astartes (Harbingers) special rule can take Focusing Crystals for +10 points.
Focusing Crystals give the character's unit a +1 modifier to their rolls at the beginning of the game to determine Samsara. Dice for the unit as well as any Mastery Levels the unit has get the +1 bonus (roll any dice with the bonus separately to those without). Additionally, friendly Psykers may re-roll one failed dice to manifest a psychic power that target's the unit with Focusing Crystals. This benefit can only be used once per Psychic Phase.
I have tweaked the Samsara ability slightly to account for some concerns that came up during discussion last night, as well as to justify the addition of the Ascetic Regimen ability. I think that the downside is sufficiently strong to make up for them as it is essentially a harsher version of the one that Sons of Horus have, as it stops them from gaining any benefits from allied characters/units.
The crystals are a nice little bonus to help enhance the army's main benefit (Samsara) and also makes buffing powers more reliable on your own units, which feels fitting for one of the pre-eminent divination legions.
Anyway, I think that's everything I have for now. Look forward to hearing people's thoughts on this.