Blue crystal

Thank you all for the information about the map's difficulty.
I've posted an updated version in the topic header. Changes:

- Added 2 one-way portals to "dead ends" near the town;
- Added more resources and neutral creatures near the town;
- The enemy army has not changed much, but their development has been slowed down (spells of levels 3, 4, and 5 are given later, powerful artifacts are given later);
- The intervals between the appearance of enemy pairs have been slightly increased and decrease 2 times slower over time;
- The armies of the guardians have been significantly reduced.