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Lighting the Dark
Defeat Nullaeus in his lair on Tier ?? before the release of the next season of delves.
Lighting the Dark requires defeating Nullaeus in his lair on Tier ?? of a delve before the current delve season ends, rewarding the title 'the Ominous'.
Choose Your Spec and Companion
Run this delve as a Healer spec with Valeera set to DPS. One approach used Holy Paladin Lightsmith at item level 264 with Valeera at companion level 43 in DPS spec; another used Protection Warrior at item level 238 with Valeera at level 18 in Healer spec.
Equip Your Curios
Slot Porcelain Blade Tip as your Combat Curio and Overflowing Voidspire as your Utility Curio. The Protection Warrior approach also used 
Crucible of Erratic Energies as a trinket alongside 
Potent Healing Potions.
Do Not DPS the Boss
Focus your damage output exclusively during add phases — your damage to Nullaeus directly is irrelevant. Save DPS cooldowns for when adds spawn.
Avoid Purple and Void Orbs
Step out of any purple ground effects immediately, and in later phases dodge the rotating void orb.
Interrupt and Reflect Key Spells
Always interrupt Emptiness of the Void. If playing Protection Warrior, use Spell Reflection on Devouring Essence for free damage; Valeera will dispel Devouring Essence if it lands on you.
Manage Valeera's Health
Keep Valeera between 60% and 90% HP rather than topping her off constantly, and use basic heals to maintain that range.
Maintain Defensive Cooldowns
If playing Protection Warrior, keep Shield Block active as much as possible, use Shield Charge on cooldown, and spend excess rage on Ignore Pain over Revenge or Execute. Use Shield Wall as a last resort.