When playing Diablo 2 Resurrected, you can see players running around with what appear to be dozens of mercenaries hot on their heels, helping the player destroy any demons in their path. The truth, however, is that players can only have one mercenary. at a time.
Chances are if you encountered someone with multiple minions, that person was probably a necromancer. Necromancers can control more than 20 minions at a time in some builds, and those minions can be difficult to distinguish between mercenaries for some people.
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You might also see a group running around with several mercenaries. This might give the impression that the mercenaries are all hired by one player, but that is not the case. Since the original release of Diablo II, Mercenaries have had a strict limit of one per person. If you hire a new one, the other will be immediately fired and replaced.
After its original release in 2000, Mercenaries were almost immediately dismissed as a useless feature in the game because they were simply too weak to survive, or it took too long to level them up. Instead of changing it so that players can hire multiple mercenaries to compensate for this, development company Diablo Blizzard opted to allow players to equip mercenaries.
For now, that's how they've kept mercenaries in the game.
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