Tactics against Necromancers.

If you can do what I described and also buy everything in the second week and leave, then I'll take my hat off to you. I haven't been able to do it even once! And it's also hard to find outer dragons; the Conservatory only works if there are 10 or a maximum of 20 griffins in a group (with 20, the losses are already significant).
But in principle, in the second week, Shaktis are better; after that, they're not so good, especially against Necropolis.

If you get about 7 attack points + the Expert Attack skill, and also use such a great spell as Blessing, then 200 hellish troglodytes can wipe out a pack of 30 griffins with one hit (and if you level up a bit more or find a few more troglodytes, you can even take out 40 with one hit)! That's the math for you!!!
A strong start is important because you can finish the game very quickly! And the most important thing: +1 speed for a troglodyte at the beginning is 100 times better than +1 speed for a minotaur later!