an unmasked changeling  

Not level 20. I was just fighting a blue greater skelly (Blue to L12, this spawn was blue or white or yellow at level 11) just inside Kurns. It was one of the very 1st static skellies by the pillar as soon as you zone in.

It had to be level 10 or 11, it turned into an unmasked changling at 35% or so. It was still a blue con and died very easily. Not a bad aug for a level 12. Too bad you have to be 15 to use it. =\

Here is a listing of all of the new Augments in the current Hot Zones
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They drop off random mobs, typically close to the entrance, from a mid-range mob for the zone.

Minor Stone of Power Level 20: Kurn's Tower (AC: +2, HP: +5)
Lesser Stone of Power Level 25: Unrest (Mana: +5, End: +5)
Stone of Power Level 30: Tower of Frozen Shadow (Wis: +5 Int: +5 Mana: +10 End: +10)
Greater Stone of Power Level 35: Lower Guk (AC: +5, HP: +10)
Minor Stone of Might Level 40: The Hole (Resists: +2, HP: +25)
Lesser Stone of Might Level 45: Chardok (Mana: +30, End: +30)
Stone of Might Level 50: Old Sebilis (AC: +8, HP: +30)
Greater Stone of Might Level 55: Grieg's End (Mana: +40, End: +40)
Stone of Greatness Level 60: Cazic Thule (AC: +10, HP: +45)
no info yet... Level 65: Splitpaw Lair (no one ever goes there!)

Four of these are Melee augs (HP, AC) and four are caster based (Mana, End), one for Resists (MR, CR, FR, DR, PR). The Stone of Power from the Tower of Frozen Shadow is especially nice for casters. I would guess that the Splitpaw Lair one would be Resist based too, if anyone ever hunted there...