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Also, I'm pretty sure you hit auto-crit success at making weak undead pretty quickly.
Going by the DCs under Game Mastering, this is very much a no.
At the ritual’s culmination, you must attempt the skill check listed in the Primary Check entry to determine the ritual’s outcome. Primary checks usually have a very hard DC for a level that’s twice the ritual’s spell level.
For the lowest level of undead, the ritual is 2nd level and thus the DC is that of a very hard 4th level spell, meaning DC 28 (23+5).
To crit succeed and get a minion out of it, you'd need to make a 38 on Arcana/Occult/Religion while your secondary caster needs a 23 Religion check (difficulty: standard 4th) to avoid penalizing you.
That's... level 15, legendary in the skill of choice, and with a 20 in Int, along with Assurance, to guarantee a level 1 minion out of the ritual.
I really hope I'm missing something in the ritual rules...