Nostalrius Begins - Quality wow vanilla realm (1.12)

Hello. Can i use warlock's spell "Enslave Demon" on elite demons <=62 lvl in Blasted lands, Winterspring or anywhere else and use them in pvp\farm or it can be a reason for ban?

If that was banable there would be no wlock remaining on this server

To be fair, people have gotten banned on this server just for mining really well.

But no, using Enslave Demon on elite demons is not bannable.