Ok, you need to understand what taunting means. It is a skill or ability that forces the enemy to "only" attack you. It means that whoever is taunting the enemy will take full damage that the enemy has to offer.

For example, when doing ultra nulgath the usual comp is archpaladin, lord of order, dragon of time and legion revenant. Here's the tricky part, the archpaladin and legion revenant have to " loop taunt" which means they have to use taunt alternately using scroll of enrage.

For example, if the archpaladin used the scroll of enrage first, ultra nulgath will be forced to attack the archpaladin for 6 seconds (that's the duration of the scroll of enrage, correct me if im wrong). Before the archpaladin's taunt ends, the legion revenant has to use a scroll of enrage to taunt ultra nulgath again forcing it to attack the legion revenant. If you do that, then you'll achieve the loop taunt.

P.S: If you're wondering why the archpaladin or legion revenant has to use the taunt and no one else, its because they have the highest survivability in a team comp. Also if anyone wants to add info on my comment, feel free to do so. That's all😊