The amount of soulseals needed to enter the soulpit depends on the creature difficulty:
| harmless | 10 soulseals |
| trivial | 20 soulseals |
| easy | 30 soulseals |
| medium | 40 soulseals |
| hard | 50 soulseals |
| challenging | 60 soulseals |
Because we're interested in any creature whatsoever, we should get the weakest ones possible.
Ideally we'd kill 200 harmless creatures, but there aren't 200 harmless creatures in the game, then we have to kill some of the stronger ones.
As of now, we have the following amount of creatures available for each difficulty for solo soulpit:
| harmless | 15 creatures |
| trivial | 37 creatures |
| easy | 126 creatures |
| medium | 221 creatures |
| hard | 188 creatures |
| challenging | 55 creatures |
Given that, we should get the weakest 200 available: 15 harmless, 37 trivial, 126 easy and 22 medium.
This should totalize 200 creatures. The amount of soulseals needed will be:
15 * 10 + 37 * 20 + 126 * 30 + 22 * 40 = 5550
This means we need 5550 soulseals to kill the 200 weakest creatures available for solo soulpit.
Because we can get at most 18 soulseals per week, this is the amount of time it would take for each number of soulseals between 1 and 18 you would get per week:
getting 18 soulseals per week, it'd take approximately 6 years
getting 17 soulseals per week, it'd take approximately 6 years
getting 16 soulseals per week, it'd take approximately 7 years
getting 15 soulseals per week, it'd take approximately 7 years
getting 14 soulseals per week, it'd take approximately 8 years
getting 13 soulseals per week, it'd take approximately 8 years
getting 12 soulseals per week, it'd take approximately 9 years
getting 11 soulseals per week, it'd take approximately 10 years
getting 10 soulseals per week, it'd take approximately 11 years
getting 9 soulseals per week, it'd take approximately 12 years
getting 8 soulseals per week, it'd take approximately 13 years
getting 7 soulseals per week, it'd take approximately 15 years
getting 6 soulseals per week, it'd take approximately 18 years
getting 5 soulseals per week, it'd take approximately 21 years
getting 4 soulseals per week, it'd take approximately 27 years
getting 3 soulseals per week, it'd take approximately 36 years
getting 2 soulseals per week, it'd take approximately 53 years
getting 1 soulseal per week, it'd take approximately 107 years
(assuming 52 weeks per year.)
Conclusion
It's quite inefficient to get 200 animus mastery this way. It seems to be much easier to do regular soul cores and use soulseals for creatures that are harder to find a core for - or specific creatures you are interested in.