Name: Nevermelting Ice Crystal
Type: Epic Trinket
Attributes: Increases spell power by 111 on equip, on use increases your critical strike rating by [184 * 71564u] for 20 sec. Every time one of your non-periodic spells deals a critical strike, the bonus is reduced by 184 critical strike rating. (3 Min Cooldown)
So if you're like me and play melee classes almost exclusively, you may not really understand why this trinket is good. Partially the demand for the Nevermelting Ice Crystal is due to the scarcity of trinkets in general: I know casters in full ICC25/TotGC gear who want this! When you realize some mages out there are raiding up to TotC with a Sundial of the Exiled equipped, you can understand the hunger for this trinket to some degree. Now, comparing this trinket to the once-majestic Illustration of the Dragon Soul, even a melee moron like me can see that it has more than half the spell power of the IotDS fully stacked (and since you don't have to stack the Nevermelting up that seems pretty good to me) plus a sweet on use ability.
However, in the hands of a spell flinger who is fortunate enough to have Damage over Time spells that can critically hit through talent choices, glyphs or set bonuses, this is an astonishingly good trinket (I'm told). Because the on use boost to critical hit doesn't degrade from damage over time spells, you could use the trinket and then DoT up everything and the DoT crits wouldn't lose their crit bonus until the effect just ran out, there would be no loss of 184 crit strike rating per crit.
So if you were, say, a mage with Glyph of Living Bomb this would be one heck of a sweet trinket for you.
How to Get It: Run Heroic Pit of Saron a lot. Kill Scourgelord Tyrannus. Curse as he yet again drops the 2h axe or tanking sword. Bother me again the next day for another run. Repeat until madness threatens to consume us both. Then laugh as it finally drops and yay we never have to come back here again! Oh wait you have a shadow priest who wants it too why do you do this to me?
Getting Rid of It: You'd better not even think about getting rid of this after the sixty times you made me run this place. If you get a better trinket, I don't want to hear about it. No. No, you just keep it forever. Don't disenchant it into an abyss crystal, don't vendor it for 11 gold, 39 silver, 40 copper, it's your forever as far as I'm concerned.