First draft of the rules (will add spell list later today). I'm aware this is a very powerful ability, but I believe hierarchs need it: the data I was able to find estimates the numbers of Modron to about 350 million. That means an average decaton hierarch would be in charge of roughly 3.5 million subordinates (out of that, 3 million monodrones)
HIERARCH SPELLCASTING
All the modron hierarchs have access to a specialised form of spellcasting. They cast spontaneously, with full access to spell list. The spells are cast as spelllike abilities, with no need for components except XP components where applicable.
* Unless otherwise noted, a hierarch’s multitasking abilities make it possible to maintain concentration and use spelllike abilities while performing other actions - however, it doesn’t allow using two spells or spellike abilities in the same turn, unless one of them is quickened.
A hierarch can cast a following number of spells per day (spells available increase only on those levels - typically at promotion). A hierarch receives no bonus spells, but otherwise casting is intelligence-based. Caster level is equal to the hierarch’s HD.
8 level: -,6,6,4,2
10 level: -,6,6,6,4,2,
12 level: -,8,6,6,6,4,2,
14 level: -,8,8,6,6,6,4,2,
16 level: -,8,8,8,6,6,6,4,2,
18 level: -,8,8,8,8,6,6,6,4,2,
20 level: -,8,8,8,8,8,6,6,6,4,
(all relevant 1st level spells are available as SLA anyway)
A hierarch doesn’t need to rest to regain spells, instead recovering half the spells allowance every 12 hours.
HIERARCH SPELLS:
(note that modron bodies and natural weapons count as armor and weapons for the purpose of buff spells.)
0: detect poison, read magic, mage hand,
1: alarm, benign transposition, floating disc, identify, mage armor, magic missile, protection from chaos/evil/good, repair light damage, sanctuary,
2: align weapon, augury, bear’s endurance, bull’s strength, calm emotions, detect thoughts, fox’ cunning, gust of wind, repair moderate damage, owl’s wisdom, scorching ray, silence, zone of truth,
3: arcane sight, daylight, deeper darkness,fireball, haste, hold person, invisibility purge, lightning bolt, locate object, mage armor: greater, mage armor mass, magic circle against chaos/evil/good, protection from energy, repair serious damage, stinking cloud, stone shape,
4: cone of cold, death ward, dimensional anchor, dimension door, discern lies, dismissal, divination, divine power, freedom of movement, magic weapon: greater, minor creation, orb of force, ray deflection, repair critical damage, resistance: greater, resist energy: mass, sending, shout, spell immunity,
5: break enchantment, cloudkill, hold monster, major creation, plane shift, repair light damage: mass, righteous might, scrying, telekinesis, teleport, wall of force,
6: analyze dweomer, banishment, bear endurance: mass, bull’s strength: mass, cat’s grace: mass, chain lightning, disintegrate, energy immunity, find the path, legend lore, resistance :superior, total repair,
7: arcane sight: greater, dictum, ethereal jaunt, force cage, reverse gravity, scrying: greater, teleport: greater, teleport object. vision
8: chain dispel, dimensional lock, discern location, invisibility: superior, mind blank, plane shift: greater
9: disjunction, effulgent epuration, hold monster: mass, implosion, miracle, sphere of ultimate destruction, teleportation circle, time stop,
* True sight and dispel / greater dispel will be available as SLA)