Michaelsoftman
Terrarian
You're using negative numbers for NPCType which won't work, NetID npcs are weird when it comes to summoning them. It spawns the actual base NPC, like a Blue Slime, then applies the NetID defaults to it to change it to another, like Green Slime.
Also if you are in multiplayer, you should always spawn an NPC on the Server, so it's spawned for everyone.
Also if you are in multiplayer, you should always spawn an NPC on the Server, so it's spawned for everyone.