Originally posted by orathaic
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- The spell as a rote, which means either requisitioning a grimmoire via Order status (doubling the casting time), finding one, borrowing one via a boon, finding a mentor or creating the rote yourself. It then needs to have a skill mudra that the caster has maximum proficiency in (which can be arranged with Mind).
- A master level in that Arcana, meaning heavy Arcane XP investment
- A safe space where they can commit for 6 hours of uninterrupted casting. This would grant a +7 bonus, which is compromised of a +5 from extended ritual time (core book page 114) and a +2 from using a ritual time cleansing yantra (Signs of Sorcery page 53). Reporters, enemies and local Sleepers can all cause interruptions and this is more likely in a largely populated target area.
- Casting a mantra only takes a turn, so one might as well use it
- Since the spell is taking ritual time, throw a +2 from a rune for free if casting on the area. Otherwise, they would need to paint runes in all 5000 subjects.
With the mantra, mudra, cleansing and rune, all 4 yantra slots for a Gnosis 5 mage are taken. At that point, the easiest way to add more dice is probably to use a high Potency version of Exceptional Luck (core book page 135).
Even then, provided the runes aren't used, the other alternatives require heavy investment. The +2 sacraments require the mage to go through extra effort to get the needed supernatural components and a Shadow Name may not necessarily symbollically resonate with the spell. The dedicated Shadow Name, the custom rote, the rare ingredients, this sounds like a cast conducted with ample preparation and investment, pulling it off is anything but simple.
Additional notes:
The teamwork spell would require people who know the Arcanum to avoid a -3 penalty (core book page 119) and have rehersed the casting to avoid the -2 penalty (Signs of Sorcery page 55), adding more preparation time.
Assuming all are Gnosis 5 masters, the instant spell would cause 9 paradox dice, since Gnosis 5 gets 3 dice per Reach. This is the bare minimum per caster, provided their Paradox pool is clean at that point. So preparing a lot of mana is necessary to avoid potentially summoning a Rank 6 Abyssal Invader (core book 116), which would not only cause cataclysmic harm, but also be near impossible for non-archmages to banish. Even if the casters managed to send the Invader back, the Lex Magicka would probably rule this as a crime worthy of Spiritual Oblivion (destroying the condemned's soul).
Lastly, you would need to supplement it with a way for all participants to magically perceive all possible targets, otherwise sensory range will not be able to affect all subjects.
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