1) It is a crystalline orb
2) Drop location... SE of Halas N of Mt. Hatespike in a freezeblood goblin camp. Tak Frostbiter drops this along with two other crap items: iceworn boots and iceworn necklace. Tak spawns in the back of any of the four igloos, in a most likely repeating pattern. If a cleric spawns in that place, kill it. If the placeholder is left alive in one igloo, no other placeholders or Tak can spawn. Tak has a varied spawn time. I've had him spawn instantly after i killed him once. I know one guy who waited at the camp 12 hrs straight (i was with him for 5) to have him spawn. The camp is along the river, N of Diren's Hold. It is the camp on the E side of the river (I think) and usually has some hi lvl ppl in it. Rumor is that Tak spawns only in the top igloo; that is BS. I've killed him in all four. Another rumor is that the orb drops once a day. Once again, BS. It is a totally random loot; although the boots seem to be a bit more common. I have had very good luck here, farming a total of 7 orbs. I sold 4 of em and gave 3 away to guildies, buds, and what not. It can turn into a KSing competition for Tak though, so beware.
3) Tak is a lvl 23-24 healer/caster. The wandering freezebloods range from 15-22 or so.
4) GL!