Thats a DoT and no dot is burst. With the 6 second version I don’t think there was an initial damage, there are so many versions. lvl 60 was the 21 second version.
DoTs are not burst damage because you must wait the full duration to get the damage.
DD you can still get a DoT but most of the damage is after the cast time.
Burst is a lot of damage more or less instant. Or over a very short period. You chain a number together, then face a big fall off.
DoTs provide sustained DPS, without the “burst damage” of an equivalent [Direct Damage] attack. DD can be fireball even with the fact it has a DoT.
[Patch 6.2.2] Devouring Plague now deals 10% more damage. In PvP combat, Devouring Plague now deals 10% less damage.
[Patch 6.2.0] : Devouring Plague now deals 12% less damage.
[Patch 6.0.2] (14-October-2014): Devouring Plague now always costs 3 Shadow Orbs, and now heals the Priest for 100% of all damage it deals, instead of healing per tick.
Consumes 3 Shadow Orbs to deal x Shadow damage and then an additional 100% of the initial damage over 6 sec. Heals the caster for 100% of damage done.
Would call that a DoT as per the wiki. You have to wait 6 seconds for full effect.
How would that DoT stack against the current burst damage of say a fire mage?
Were proper chaining of Rune of Power, Meteor, Fire Blast, and Pyroblast, while Combustion is active, creates an insane amount of burst damage for 10 seconds.
Rune of Power
Places a Rune of Power on the ground for 10 sec which increases your spell damage by 40% while you stand within 8 yds.
Meteor
Calls down a meteor which lands at the target location after 3 sec, dealing (260% of Spell power) Fire damage, split evenly between all targets within 8 yards, and burns the ground, dealing [8 * (8.25% of Spell power)] Fire damage over 8.5 sec to all enemies in the area.
Fire Blast
Blasts the enemy for (72% of Spell power) Fire damage.
Pyroblast
Hurls an immense fiery boulder that causes (123.9% of Spell power) Fire damage.
Deals an additional (18.6% of Spell power) Fire damage over 6 sec.
Combustion
Engulfs you in flames for 10 sec, increasing your spells’ critical strike chance by 100% and granting you Mastery equal to 50% your Critical Strike stat. Castable while casting other spells.