I will repost something I replied to an older topic on Teleport, with some updates based on what was discussed later in that topic - essentially here is my Teleport suggestion:
I. Technical Improvements
• micro cooldown (Aether Walker) should be removed or at least shortened.
• casting animation should be faster and take attack speed into account
• the nasty path finding for Teleport should be improved
II. Changes to Skills (mechanic/runes)
Teleport [Defensive]
Costs: 50 Arcane Power per cast.
Teleport through the ether to the selected location up to 50 yards away.Runes:
- Safe Passage [Level 26] [Cold]
For 5 seconds after you Teleport, you will take 25% less damage.- Wormhole [Level 31] [Lightning]
Your pickup radius increases the maximum range of Teleport to 65 yards and you leave an after image at your old location that lasts three seconds.- Rush [Level 37] [Fire]
Reduces the resource costs to 30 Arcane Power per cast.- Fracture [Level 43] [Arcane]
You summon 2 Mirror Images after teleporting.- Calamity [Level 59] [Arcane]
Cast a short range Wave of Force upon arrival, dealing 175% weapon damage as Arcane to all nearby enemies and stunning them for 1 second.
Illusionist [Passive]
When you take more than 15% of your maximum Life in damage within 1 second, the cooldowns on Mirror Image and Slow Time are reset and your Teleport skill will not consume Arcane Power for three seconds.
When you use Mirror Image, Slow Time, or Teleport, your movement speed is increased by 30% for 3 seconds.
III. Changes to Items
Aether Walker [Legendary Wand] [RETROACTIVE CHANGE]
Teleport gains the Calamity rune, releases your Wave of Force and now stuns for 2 seconds. Enemies hit by Wave of Force take 300-350% increased damage from your Arcane Power spending or generating skills for 5 seconds.
The Oculus [Legendary Source] [RETROACTIVE CHANGE]
blue affix “Reduces cooldown of Teleport by [1 - 4] seconds” retroactively replaced by “Reduces cooldown of Unstable Anomaly by [11-15] seconds”
Legendary Affix retroactively replaced by:
You gain the Unstable Anomaly passive and when the passive is triggered your active cooldowns, including potions, are reset. While Unstable Anomaly is on cooldown all damage dealt is increased by 75-100% and all damage taken is halved.
Cosmic Strand [Legendary Source] [NOT RETROACTIVE]
Black Hole gains the Supermassive rune, lasts for three seconds and your pickup radius increases its area of effect further (up to a maximum of 30 yards). Enemies hit by Black Hole take 250-300% increased damage from your Arcane Power spending or generating attacks for 6 seconds.
IV. Reasoning
Changing Teleport to resources will make the old Teleport items obsolete, hence the retroactive changes. I know, those are hated, but I think this time they would be okay and most players will welcome them.
Regarding items… I originally planned to make The Oculus a Black Hole item, but I remembered that this thing is present in Vanilla, while Black Hole is a RoS only skill. Conclusion: that won’t do. Thus, I went for an Unstable Anomaly mechanic which is something new and it would work for D3 Vanilla.
I also removed the 30% RCR from my original Rush rune suggestion, as there is Cindercoat in the picture - reduced costs and additional RCR might be overdoing it a little.
Finally I choose Cosmic Strand to become a Black Hole item, which has been reworked as well, now it should improve Black Hole utility instead of plainly upping its damage.