There is a twitch promotion allowing you to get Purple Footprints EffectPurple Footprints EffectBoots Modifier
Stack Size: 20Adds purple footprints to a pair of boots.Right click this item then left click some boots to apply it., Purple Weapon EffectPurple Weapon EffectWeapon Effect
Stack Size: 20Adds a Purple effect to a weapon.Right click this item then left click a weapon to apply it. and Purple Portal EffectPurple Portal EffectPortal ModificationThis character's portals use a purple effect.Right click this to set or remove your Portal effect. if you have twitch prime.
Cobalt JewelLimited to: 1(20-30)% increased Mana Regeneration Rate
(40-60)% increased Spell Damage while no Mana is ReservedWhen your thoughts flow like a river, why build a dam?Place into an allocated jewel socket on the Passive Skill Tree. Right click to remove from the Socket.
Life reservation: If an aura is supported with Blood Magic SupportBlood Magic SupportSupport
Mana Multiplier: (245% to 196%)Requires Level 31Per 1% Quality:
Supported Skills have 0.5% reduced Mana CostSupported Skills spend Life instead of ManaThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket. to reserve life, then it is not reserving mana and the spell damage bonus from Clear Mind applies as expected.
Another way to use an aura and not reserve mana is to use the unique ring Essence WormEssence Worm
Unset RingRequires Level 38Has 1 Socket+2 to Level of Socketed Aura Gems
Socketed Gems Reserve No Mana
40% increased Mana Reserved"This thing is not a pet. It is a parasite that feeds on the very will of its host.
Like any part of nightmare, it has found a way to make its price... acceptable."
- Malachai the Soulless, whish causes socketed skill to not reserve mana.