To give you an idea of the Destruction Warlock in action, here’s a basic look at their core combat abilities:
Incinerate
6% Mana, 40 yd range, 2 sec cast
Draws fire toward the enemy, dealing moderate Fire damage.
Immolate
6% Mana, 40 yd range, 1.5 sec cast
Burns the enemy with fire, causing minor Fire damage and an additional strong Fire damage over 15 sec.
Immolate critical strikes have a 30% chance to generate a Soul Shard.
Conflagrate
2% Mana, 40 yd range, Instant, 8 sec recharge, 2 charges
Triggers an explosion of fire on the target, dealing moderate Fire damage and generating a Soul Shard.
Also causes Backdraft, reducing the cast times of Incinerate and Chaos Bolt by 30% for 5 sec.
Chaos Bolt
2 Soul Shards, 40 yd range, 2.5 sec cast
Unleashes a devastating blast of chaos, causing huge Shadow damage. Chaos Bolt always critically strikes and your critical strike chance increases its damage.
Havoc
8% Mana, 40 yd range, Instant, 20 sec cooldown
Mark a target with Havoc for 8 sec, causing your single target spells to also strike them. Limit 1.
Mastery: Chaotic Energies
Your Destruction spells deal up to 40% (with Mastery from typical gear) additional damage, randomly.
Additionally, to provide a glimpse at how some talents may build upon this, here’s one example of a Destruction-specific talent:
Channel Demonfire
4.8% Mana, Channeled, 12 se cooldown
Launches 15 bolts of felfire at Immolated enemies within 40 yds, over 3 sec. Each bolt deals moderate Fire damage.