- You have to be a School of Necromancy Wizard. Cleric gets a couple of the spells but nothing else.
- How does School of Necromancy pan out in terms of supporting undead?
+6th level:
When you cast Animate Undead, you can animate your normal number n plus one additional corpse.
Undead add your Wizard level to their HP maximum and gains your proficiency bonus to their damage rolls
+14th level:
With range 60' you can attempt to bring
one existing undead under your control, at spell save DC vs. Cha. If the target makes their save, you can't try again. Ever. If they fail their save, they obey you
until you use it again. So you can only ever control one undead like this. Oh, and if the target has 8+ Int, it gains advantage on the Cha roll. If it has 12+ Int and fails the roll, it can retry every hour. So all this is good for is grabbing a single mundane undead; intelligent undead are going to beat the save one way or another.
+Oh wait, that's all the school has to offer re: undead.
1. Animate Dead, 3rd level. Only works on Medium and Small humanoids. You can command undead created like this with a bonus action if they're within 60'. Here's the kicker:
"The creature is under your control for 24 hours, after which it stops obeying any command you've given it. To maintain control of the creature for another 24 hours, you must cast this spell on the creature again before the current 24 hour period ends. It scales with level, barely; each spell slot over 3rd allows you to animate 2 additional corpses of the same type.
So you're permanently gimping your casting by one 3rd/4th/5th/&c. spell slot for every 2/4/6/&c. bog-standard near-useless zombies or skeletons you want to control. Remember, 3.5e's Animate Dead creates undead that are yours until they're destroyed or you release them, with a limit based on your CL instead; further, it doesn't specify Medium or Small corpses, only limiting you by total HD controlled. And it doesn't use spell slots after the initial casting.
2. Create Undead, 6th level. Requires 150gp of black onyx per corpse. Can only be used at night. Can only be used on Medium and Small humanoids. Up to three of those become ghouls under your control. Same control mechanics, except at 120'. Exact same control parameters as Animate Dead, except that casting at 7th level adds one more ghoul, and 8th adds two ghouls or lets you do two ghasts or wights instead. At 9th you can do six ghouls/three ghasts/three wights/two mummies (your choice).
So you're burning a 9th level slot every day for shittier undead than a low-level 3.5e necromancer could get with a single cast of a 3rd level spell. Once. No repeat casts. Oh, and you're burning 150gp per corpse instead of 25gp per HD.
To make this perfectly clear: a 20th level 5e wizard gets one (count it, one) 9th and 8th level spell slot, two 7th and 6th, three 5th-3rd, and that's all you get for making undead. If you devoted all of that to Animate Dead as a School of Necromancy wizard, you could have a total of 113 Small or Medium zombies or skeletons under your control. In exchange for never casting spells above 2nd level, or burning your arcane recovery as soon as you finish your undead upkeep for a grand total of 10 levels worth of spell slots of 5th level or below. If you choose to use your 6th-9th slots to make better undead, you instead get 45 crappy undead + 14 ghouls + 5 ghouls/2 ghasts/2 wights + 6 ghouls/3 ghasts/3 wights/2 mummies.