Go 6 Warlock, 3 paladin, 11 Cleric for the heal spell.
Max Con, rest into Cha and Int. All level ups in Con.
Skills: Spellcraft, Perform, Umd
Feats: Maximize, Empower, Quicken and whatever. (I like shield mastery and improved shield mastery or the +1% crit chance sp ones depending on dps or survivability.)
Enchantments. ES up to tier 5. Pally for the extra 20% hp and defences, TS for utterdark blast and strong pacts, cleric ones for more light spellpower.
You will be very survivable, your dps will be low but AOE.
Epic destinies: Exalted angel or Unyielding sentinel or Shiradi Champion.
Hope that helps!
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