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The strongest unit in the enemy stack is necromanced, and it is this unit's tier that matters. You only get units if you have undead of that tier.
Skeletons can be obtained by excluding them from tier 1 enemies, i.e., they are not necromanced in the endgame.
Diplomacy is always paid and only available if you have the skill. Exception: a full set of artifacts for diplomacy.
Skeletons can be obtained by excluding them from tier 1 enemies, i.e., they are not necromanced in the endgame.
Diplomacy is always paid and only available if you have the skill. Exception: a full set of artifacts for diplomacy.