I've dont' 7 runs in a row now for Mad Dragon trying to get the T1 helm for Divine Emissary's set. Not a single epic has dropped from the last boss. So does that helm only drop out of the chest during DD?
Set item droprates are about 1/10, and then you have a 1/15 chance of getting the specific set item you want (5 classes, 3 sets each). So, about a 0.67%~ chance, or 1/150.
You're better off just doing dungeon delves. You probably have around a 1/6 chance of getting what you want from them.
Note: These values are all just guesses from personal experience.
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Though I heard you can use your credit card to increase that chance. Again, I heard that in a back alley somewhere so don't trust it.
A bit of nostalgia for the old timers.
PVP guide - Keeping it fun with the basics.
You're better off just doing dungeon delves. You probably have around a 1/6 chance of getting what you want from them.
Note: These values are all just guesses from personal experience.