You're forgetting, why would the corpse have germs on it because it's dead, viruses and bacteria can't live on a dead human

Does Grim Harvest trigger when my minions kill something?

No, because you do dont use the spell to kill the enemy. You use the spell to control your undead, the undead is a seperate creature from you. 

thanks

I often see this cast using a single bone...but by any description of this spell it requires either a body or pile of bones... not just one.

It will attack the nearest creature that is not undead.

if I took the feat meta magic adept and chose Extended Spell as one of the options, I could double the duration, right?

"So if I ressurect a skeleton could I (before the 24 hour period) command it to enter my "bag of holding". What will happen? They cant leave it correct? So in theory I can fill it with 10-20 skeletons and make one and have it take my bag of holding and dump it in the middle of a fight, unleashing a macabre little army?"

I mean, they wont do anything unless attacked. or if the DM wants, they could even attack your party instead.

To keep my DM'ing simple, my BBEG necromancer only had 4 undead with him as bodyguards instead of a horde.  However, I made them sidekicks using Tasha's rules.  Having 2 armored warrior zombies running defense and 2 sniping expert skeletons providing damage and the distance Help actions worked amazingly!  Just be sure to give them Amulets of Protection from Turning so they don't flee when the cleric turns undead.  I told my players they could have undead sidekicks too but none of them want to dabble in necromancy haha.

40 should be the most possible in the described scenario even if you were a wizard of the necromancy school.

Did I math wrong?

In order of level, (3*4)+(3*6)+(2*8)+(2*10)=66. The second 6th level was from Arcane Recovery.

Or is there a cap? Did I miss something?

Hey, quick question to those who may be seeing this, if you are playing a Warlock and take this as an Eldritch Invocation, it says that it casts the spell without using a spell slot. My main issue is that if you have 4th level or 5th level spell slots, but the spell is 3rd level, what level does the spell cast at?

Does it cast at 3rd since that's what the level of the spell is and it casts "without using a spell slot", or does it cast at 4th/5th level (depending on what slots you have) since Warlocks always cast spells at the highest spell slot level they have?

they wont eat you in your sleap they will just revert to not listening to you which for zombies is just standing around rotting and for skeletons is mimicking what they did in life

If I'm a fifth-level/necromancer can I animate skeletons four lose control of them then regain control over all of them?

Quote from Videoms >>

You're forgetting, why would the corpse have germs on it because it's dead, viruses and bacteria can't live on a dead human

 Well *that's* not true. Bacteria *loves* dead things. 

Not so much viruses. But still

Quote from HopefullRLbard >>

they wont eat you in your sleap they will just revert to not listening to you which for zombies is just standing around rotting and for skeletons is mimicking what they did in life

 The thing is, Skeletons and Zombies attack any living thing they can sense, so if they are near you, they WILL eat you in your sleep

Quote from PhrankinStyne >>

So if I ressurect a skeleton could I (before the 24 hour period) command it to enter my "bag of holding". What will happen? They cant leave it correct? So in theory I can fill it with 10-20 skeletons and make one and have it take my bag of holding and dump it in the middle of a fight, unleashing a macabre little army? 

 You COULD do that, BUT undead attack any living thing they can sense. A DM trying to make the game more realistic will make the undead attack the nearest living thing (including your enemies if they are living) BUT a DM technically can make the undead focus on you and say that they are using a "strategy" by focusing on a specific group of living beings first.

I made a warlock subclass Called "The Undead (Necromancer)" that had a lvl. 1 feature that makes all summoned undead obey you permanently without thinking about how OP this could be. Should I eliminate or change this feature because at lvl. 5 it would be OP or should I leave it like that because at levels 12 or 13 these undead basically can't hit the enemies since they have a too high AC for them?

Divine Soul Sorcerer just took this. Taking a look at this, using enlarge/reduce and Heigtened meta magic, would this legally target normally large creatures (Like an ogre?).  Then you can haste your zombie, maybe warding bond, bless, divine shield, or protection from good and evil to turn your tank into a killing machine.

It says using this spell reasserts your control over up to four undead. Wouldn’t that mean you can only have a maximum of four?