Mana draining rares can have second aura and draining health

Mana drain aura on rares is way too powerful: it drains mana too fast, does significant amount of damage, auras jump from one rare to another, some rares can have invulnerability (proximity tanglibility) so require player to actually go and die in aura zone, some rares faster than player with boots for 30% speed and around 15% movement speed buff from passives, i.e. you can't run from them.

Possible solutions:
1) Mana drain and damage from aura has to be 3x less;
2) Haste and Proximity buffs should count as aura, so mana drain never occur at the same time;
3) Remove lightning damage from mana draining aura, it already too strong;