If they apply the spell following the rules of 5e you summon more undead minions at higher levels, but they´re still the same creature. Unlike in previous editions you do not animate stronger creatures, you just summon more. You also need to spend your bonus action in your turn to order them to do something and it takes one minute to cast it, so you cannot use it in combat. As said in previous posts, a strong enemy group or a cleric would make a number on them easily.
The spell is only useful in the long run if you are a necro, because they improve the hp and hit rate of the creatures when you level up. Wizs and Warlocks have better summoning spells (summon fiend spirit, conjure fay, etc). Strangely enough, they give the necros the "Animate dead" spell for free at level 6, but you can learn it at level 5 ¿?
Zombies are good meatshields if the enemy does not have radiant damage, because they keep coming back unless you kill them for good with a crit or radiant damage. The spell has a very long duration and you can recycle the same creature the next day, so you do not have to look for more corpses.
You just have to remember to kill the creature or recast the spell or the zombie will attack you the next day. Also you may not want to create a zombie apocalypse animating a lot of corpses every day and set them free. Lathander is going to frown upon it XD
If they include the school of necromancy I think you´re going to have fun with them if they use the spell in the game the same way it´s in PNP.
Last edited by _Vic_; 12/09/20 11:19 AM.