Boris K
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I don't know how much experience you'll get if you dump a week's worth of resources from three Elven castles into the pit. I only dumped the army I used to capture my home castle into it. And there's no need to do that. If I'm not mistaken (I don't save, so I can't say for sure), the upgrade location is somewhere south of the third Druid city. In my game, Agrael arrived in this mission underleveled because I quickly captured all the cities in the previous mission and wasn't in the center of the map. Still, there were enough neutral creatures for him to fully level up.