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How many necromancers out there would keep up the daily grind of Animate Dead, and how many would switch over to simply Geasing their skeletons ("don't hurt anyone I don't try to hurt first or tell you to hurt") and Mass Suggesting them to "follow me around and try to kill whatever I try to kill, and nothing else". You'd no longer have telepathic control of your skeletons as a bonus action--they'd be more like a poorly-disciplined mercenary army, a la the skeletons in Sam Raimi's Army of Darkness--but you could scale up way past the army size you could otherwise afford to control, e.g. eighty skeletons at a time is no sweat, given some downtime. (At 15th level you can start converting skeletons over to wights and have 80 wights in your army, which is a big improvement both from a combat perspective and from the Command-and-control "minions with intelligence" perspective. Pity the poor fool who decides you're a menace to society and runs straight into a company of supercharged (Necromancer-created) wights with 60 HP (resistant to non-magical non-silver weapons) and 2x(d8+7) attacks. That's 4800 HP and (1840 * hit percentage) damage per round. And they're stealthy too.)
The (idle) question I have for you is, how many of you would switch over despite the downsides, and how many would just keep casting Animate Dead methodically every day?
jaelis
Oh this is where the title goes?
TBH, as a DM, I don't think I'd let you use such an open-ended and multi-pronged suggestion.
Both Mass Suggestion and Geas imply a single objective or service, and I wouldn't call "don't hurt X" either of those.
For example, the DM could very easily have your geased skeletons attack innocents despite the geas, thereby committing suicide (what do they care, they're nearly mindless undead). In the case of suggestion, as pointed out above, he could very easily deny such a complex suggestion as being beyond the scope of the spell.
Each approach has merits as adjudicated by the DM.