I'm looking at building a teleporter build and the level 6 Conjuration Wizard ability "Benign Transposition" seems lack luster since it uses your action. I wonder why it does not proc on a bonus action since it's a :one shot ability" until you cast another conjugation spell.

Thoughts?

I think it is a very good ability.   It is a HUGE amount teleports, particularly when you trade places.  

Of course, I assume that 'cast a conjuration spell' includes ritually casting spells such as Tenser's Floating Disk.

So, each battle you start with one freebee ready to go, and then if you do not have one ready, cast Misty Step and you get your Misty step and reload your Benign.

But it burns your action on round one if you use it. Play as one of the elf variants and you basically get free misty steps right out of the gate.

This ability at level 6 seems too costly to use, especially if you're and elf variant and then also have the misty step spell.

The ability to swap with an ally is the bigger deal. Its Misty Step + a (friendly) Vortex Warp in a single spell. Its strong, but situational. Get out of a sticky situation while also getting your Paladin/Barbarian into position.

It would be absolutely busted as a bonus action. Even without the ally swap, its better than Misty Step because you can pair it with leveled spells. 

I love Benign Transposition! Combined with Misty Step it’s unbeatable!! 

Benign Transposition to trade places with a team member who is in melee and is in danger of being killed followed by Misty Step to get yourself out of melee is an awesome one-two combo! 

It is comparable to some of the other level 6 wizard school abilities.

That is a decent combo, thanks. I guess I was thinking more of an offense application, but that works!

Also worth keeping in mind you have some limited use options to build around it being an action; for example, a couple of levels in Fighter for Action Surge means you can use it plus cast a spell (maybe replenishing it in the same turn) once per short rest. Or you could pick up Metamagic Adept with the Quickened Spell metamagic to turn a spell into a bonus action once per long rest.

This gives you the option of using it to both escape and do something big in a single turn etc., won't always make sense to do it, but not a bad trick to have just in case.

Also it's a good utility feature as you can be teleporting into (or onto) places and all you have to do is cast the occasional conjuration spell (which you probably should be doing from time to time) to replenish it.

Because it is an action you can ready it. Ready it so you can misty step into the air and then use that readied benign transposition. 60 ft of teleporting ain't nothing to sniff at.

Benign Transposition + Misty Step is the Conjuration wizard’s jam.  Say your party’s super squishy Druid gets mobbed by a bunch of nasty goblins - on your action Benign Transposition with them then on your bonus action use Misty Step to leave those goblins looking at a roadrunner-shaped dissipating cloud of nothing.  Or, if your super squishy wizard is about to be squashed - Benign Transposition with your tank and have the mobs staring in the face with a cranky Barbarian instead.  I have used this many times, and everyone is always happy if they are asked if they want to “Go for a Ride” (which is what I call it, as you need permission first, haha).

It used to be good because you could swap places with someone and then misty step away, enabling you to get your allies where they need to be. Now you can just cast vortex warp.

There will be situations where its worth the action, most the time its just not action worthy especially with newer spells that do it better. 

You cannot teleport yourself using Vortex Warp. The spell description for Vortex Warp says “You magically twist space around another creature you can see within range”.  Benign Transposition lets you as an action - not a spell slot - move 30 feet to an unoccupied space you can see or alternately you can swap places with a willing creature.  Vortex Warp is not better - it is different.

Yes but misty step exists for teleporting yourself. The main thing I’ve always seen benign transposition used for is repositioning allies, which vortex warp does better.

Quote from Guillermo_Bruntoni >>

Yes but misty step exists for teleporting yourself. The main thing I’ve always seen benign transposition used for is repositioning allies, which vortex warp does better.

Compared to vortex warp, Benign Transposition does still have the advantage of using a different (sort of free) resource; you only need to misty step afterwards if swapping positions puts you in danger, but for every other situation you only need to misty step if you want to recharge your Benign Transposition (and there are other spells that can do it).

Plus misty step has the benefit of being easy to pick up a free use (and preparation) of via Fey Touched; 

Benign Transposition + Misty Step is superior to using Vortex Warp in many situations. Mostly because you can move your ally and yourself twice (once to swap, again to misty step) on the same turn and for less resources. You can't misty step and vortex warp on same turn. You can also combine them for 60 ft tp of yourself in single turn.

Vortex Warp is great if you don't need to consider action economy or want to just tp an enemy. 

Okay, I agree that there are some times that benign transposition is better than vortex warp. I don’t think benign transposition is useless, however I do think that vortex warp made it lose some of its value.