Three of them spawn right outside the circle champion Arena. Snareable, rootable, rottable, doesn't summon. 3.5 blues of xp per kill.
If only they dropped something worthwhile.... ;)
Arcstone Lavarock
Blue Diamond
Cobalt Ore
Crushed Diamond Dust
Crystallized Sulfur
Emerald
Exquisite Platinum Embossed Rune
Favor of Druzzil
Fused Loam
Golem Animation Essence
Golem Heart Stone
Jade Shard
Lucidem
Malachite
Peridot
Powder of Ro
Scale Ore
Shaped Prestidigitase
Soluble Loam
Taaffeite
Tungsten Ore
Versluierd Fungus