Dying Curse

Source
This item drops from Maexxna, Gothik the Harvester, Heigan the Unclean, and Grobbulus in the 25-man version of Naxxramas.

Effective +Spell Power
The effective spell power granted by this trinket is calculated as a function of cast-time. To get the most out of this trinket, you want shorter cast times. The formula for calculating the amount of effective +spell power is -

E = 238 * 10 / (45 + (t / 0.15)))

Where E = Effective +spell power t = Cast Time

The following Java Program can be used to obtain a table of effective +damage for different casting speeds:

public static void main(String[] args) {      float crit; float time; float effective; for(time = 1; time < 6.5f; time += 0.5f) {              effective = 238 * 10 / (45 + (time / 0.15f)); System.out.println("  " + time + " " + effective + "   "); }  }