Experience, Gold, Runes, leadership, etc. variation

[DGDobrev]

1. Summoned troops - reading through the comprehensive russian guide, there is no mention that summoned creatures do not give XP: "The experience granted to the hero for a battle is directly related to the total Leadership of all killed creatures."

So they should give, because the XP in combat is equal to 1.7% of the total Leadership of all killed enemy troops (0.017 XP per point of leadership, as stated in the game files), before any XP modifiers kick in (learning, +XP items, medals, etc.).

However, that would mean that if you get a decent item (or do that in Zilgadis' boss fight) and leave a friendly gremlin tower alive, then you simply kill anything it spawns each turn, the XP may prove to be unlimited, provided you do a couple thousand turns. Very strange, as that can be exploited.
2. Mana used - no.
3. Not losing troops - no.