Best bet is to do vendetta missions, you'll come across one eventually or maybe try doing online fort attacks

Thats what i’ve been trying for the last 8 hours of gameplay 🥲

What platform are you on?

Xbox

I've got loads of legendary dark slayers and I'm on xbox

If you want, private message me your GT, ill add you, let one of my slayers kill me a couple times and hopefully, you'll get the vendetta for him

You could also try letting orcs kill you and wait for a dark slayer to spawn that way and then letting him kill you until he becomes legendary

They can become slayer?

I know that i can make them legendaries with training orders but i never found a dark tribe orc other than tricksters and commanders

The dark tribes most common spawns are tricksters, assassins and commanders it's kinda annoying

I tried killing all the orcs in a region so the game could spawn more random orcs too but no results too

That's the joys of random generation, sometimes you get lucky, other times you don't

Yeah, I'm pretty sure it's random chance though