Well then, you'd better make sure the DoT is up then, huh? :P
The cooldown is longer than the duration as you wrote it, which means it could be up all the time. That doesn't prevent faceroll, it just adds one more button to the rotation, that is easily refreshed.
As a compromise between having it consumed and having it last the full duration, perhaps give it charges like Stormstrike? Thus it could be:
Wrath of Light
XX% of base mana 30 second cooldown
Range - 30 yards
The paladin assaults the target with a blast of holy magic. Damages the target for 700 damage, and deals 700 more damage over 30 seconds.
In addition, the paladin's next three special attacks against the target deal 10% additional damage, but consume 33% of the DoT's total duration. Damage over time does not cancel Repentance.
An example scenario:
Code:
Paladin engages boss.
Paladin casts Wrath of Light, does 700 damage and debuff is applied.
Debuff ticks once during GCD.
Paladin casts Crusader Strike. Crusader Strike gains additional 10% damage due to Wrath of Light. Wrath of Light's remaining duration reduced to 8 seconds (13 seconds - 5 seconds).
Debuff ticks again during GCD.
etc etc.
You probably noticed that I increased the cooldown. This is because I feel that having a cooldown of the same length as other paladin attacks would just make this one more key in the faceroll. By enlongating the duration and causing duration reduction, the paladin will have to make a choice (assuming the
Sanctity of Battle
change you made applies as well.)
A) Paladin uses primarily Crusader Strike. This is to capitalize on the increased crit chance, damage bonus and DoT component of the situation for long-term, non-burst fights.
B) Paladin uses CS, DS, Exorcism in quick succession as now. This will quickly consume the WoL debuff in a damage augmented burst form, but will cause WoL to terminate early into the cooldown, which will cause subsequent damage to be lesser until the debuff is restored.