Enslave Demon - This spell deserves its own chapter, as it requires a different way of playing. Let me buy C9 Gold provide the details on it first;
Enslaves the target demon, forcing it to do your bidding, while enslaved, the demon’s attack speed and casting speed is lowered 30%. Lasts up to 5 minutes.
Repeatedly enslaving the same demon lowers the max duration of the spell.
*Important: As you level, the level cap of Enslave Demon increases with you. Rank 1 Enslave Demon actually lets you enslave up to a level 45 demon if you are 60.
Rank 2 lets you enslave up to 59, and Rank 3 goes up to 74 at level 70. Using a lower rank could save a little mana sometimes, but it doesn't make much of a difference.
Basics: The first and most important thing to remember when using enslave demon is that it is going to wear off either after 5 minutes, or earlier. To monitor enslave duration, you can download an Addon that keeps track of it, like Do-timer
Unsummon your pet before trying to enslave something, or the spell will fail. For safest usage, enslave only demons of at most 2 levels above you. It is safer to enslave at or below your level. To maximize the chance that the spell will stick to the target, open with Curse of Shadow (If you’re actually high enough to have that curse).