[New Cleric Skill] Mystical Veil

Alright, so I've been playing my cleric for a couple of months now, and the one thing I've always hated about clerics is that once you've somehow gotten aggro from a boss or a large group of mobs, (either by the tank dying, or heal aggro) it is sometimes incredibly difficult to get out alive, especially if the monster chasing you is a boss.

Think about this situation for a bit. Clerics already have to sacrifice their own exp (or spend additional coins on guardian scrolls if they want to save exp) to release and revive squad members to save their exp. Every cleric I've met hates doing this, and I know many of you clerics out there leave revive at level 1 because of this ("Why should they get their exp back when I don't?")

Now, before I go on, I just want to say that this isn't just a QQ thread; I am well aware of how to play my class and how to prevent such happenings, but there are just some instances where you are doomed to die, such as when it is not you who screwed up but your squad members. Yea, you could use plume shell on yourself, holy path, guardian light, wings of protection, etc. to try to save yourself from the incoming boss, but when your base movement speed is 4.8 M/S, your Health is low, the boss moves at 15 M/S and is capable of one-hitting you, and the dungeon exit is 100 miles away, it is extremely difficult, if not impossible, to get out alive. Sure, you could suicide on the boss and use a resurrection scroll to lose your hard-earned exp to save your squad members' exp, but that does get irritating after a while.

What I've always wanted, as a cleric, is to have a skill that would dispel aggro instantly and save your sorry ****. So, I've outlined the skill I've thought up of (with inspiration from a previous MMO I played, which had a similar skill for its healers) below.

Skill: Mystical Veil

Required Spirit: 100,000
Required Coin: 150,000
Required Level: 59
Required Cultivation: Transcendent
Pre-requisite Skill: None
Mana Cost: 500
Channel Time: Instant
Cast Time: Instant
Cooldown Time: 3 Minutes (180 seconds)
Maximum Level: 1
Skill Description:

Focus your energies to create a magical veil which hides you from your enemies.

Places yourself into an ethereal state for 5 seconds; monsters and players can see you, but they can neither attack nor use skills on you.
Causes an "Anti-roar" effect; all monsters will stop attacking/chasing you and will aggro on the previous person to aggro them.
Spells casted on you before you casted this spell will be interrupted.
Stealth disappears when duration is reached, a spell is cast, or the caster moves.
Pre-maturely ending the spell freezes caster for 3 seconds.

Requires 2 Sparks

How this skill would help:
1. Allows Clerics to easily escape aggro from bosses and/or mobs.
2. Saves the Cleric's exp and allows the squad to continue with the dungeon

Balance:
1. Has a large mana cost and a long cooldown to reduce abuse.
2. If used during PvP, it acts as only a temporary distraction, similar to Clerics other protection spells.
3. Prematurely ending the spell reduces movement speed, so if the Cleric decides to cast a spell while stealthed, getting away after that is more difficult.
4. Usage of 2 sparks prevents abuse, prevents casting of Triple/Double spark while in stealth, and requires the user to think before casting the spell.

When judging, please remember to vote on concept, not numbers. Numbers can always be tweaked, so it's the concept which counts. Thank you for taking your time to read this!