Worshipper – “Ship” [Campaign 2, Mission 4]

Where on this map can I get so much experience?

Try killing all the neutral creatures, even those that try to escape, and most importantly, go to the last castle not through the "dark" path (through the Dungeon), but along the surface, capturing 2 garrisons along the way. Good luck.

P.S. I couldn't develop Agrael to the level of "Call of Urgash" because around level 27 or 28, they started giving me unnecessary skills. I had to take "Machine Management," and as a result, I didn't have enough levels. Although I reached level 30 (and even level 31 in the last mission).