[Morkilus]

Without discussing specific builds (seriously, there are hundreds of threads about this. Use your search function) I'd say you are looking for:

Hit points (at least 30)
Reinvigoration
Regeneration (not as necessary)
High defense
High protection
Damage shields or large AoE effects
Magic resistance
Strategic move (flying)

Forge a huge variety of items and play around 'til you get a good mix of these. The elemental Kings and Queens and the unique blood summons are a good place to start. Or just equip a Niefel commander.