Paladins: These can be hunted at about level 35 with 70+ distance skill by running them, they are fairly slow so running from them is easy. Beware of their very powerful melee and defense. Also note that they have self-healing so speed is important when hunting these. They can be safely soloed without running at about level 60 with 70+ distance.
Mages: Given the opportunity for running space, mages can solo these monsters around level 45 using energy attacks. Sorcerers are recommended to use a Wand of Starstorm/Cosmic Energy in combination with Energy Strike. Druids can use a rod, but for mana savings, it's probably best to not use one and just use Energy Strike. Be careful to not run into more of them, as 2-3 of them trapping you can give you a free trip to the temple quickly.
Knights: It's recommended that knights not hunt these solo at lower levels, mainly because of its strength to physical attacks, and for higher levels, the damage you'll receive will make profiting nearly impossible. If you intend to hunt them, bring a mage or pally along as a shooter and share the loot.