Recommended

For Destruction from level 10 to 90 (chosen in the Destruction specialization). Pre-casts Incinerate, keeps Immolate up, never sits on two Conflagrate charges, spends embers on Chaos Bolt (Shadowburn below 20%) at 3.5 embers or in Dark Soul: Instability, uses Backdraft on Incinerate, and fills with Incinerate; a dying target gets Shadowburn. On three or more enemies: Rain of Fire and Fire and Brimstone on four, then Immolate, Conflagrate and Incinerate, and a cue to switch Fire and Brimstone off when your embers run out. Moving: Shadowburn, Conflagrate, Fel Flame. Reminders: your pet or Grimoire of Sacrifice, Flames of Xoroth, Dark Intent, Dark Soul, Havoc on two or more enemies (cast it on the second target yourself), Doomguard or Infernal, Ember Tap and defensives.

Adapted from Warcraft Tavern: Destruction Warlock rotation (MoP), Method: Destruction Warlock guide (MoP Classic), wowtbc.gg: Destruction Warlock (MoP Classic), Hekili (MoP fork): Destruction Warlock priority.

In game: /rm set destruction chooses it by hand; it loads only for its edition and class, and is listed only for the specializations it is for.