Just throwing out an idea for a sword , gun and bomb
-Warp Edge(sword)
normal/shadow or normal/elemental damage
moderate attack speed
a chance to apply status effect "Warped" on the enemies you hit
charge attack: Teleports the user in the direction they are facing, small aoe before and after the teleportation. You can't teleport across gaps and must have line of sight. Beware, because you are teleporing yourself there is a 50% chance that you will recieve the "Warped" status effect.
-Blinkshot Gun
normal/shadow or normal/elemental damage
on hit mark the enemy; if another enemy is marked(by you) when you hit an enemy then the two switch places and take damage
charge attack: the enemy you hit is switched with a copy of yourself from another similar dimension. Your copy taunts the surrounding enemies untill the time runs out or your copy dies;- when one of the two happens the enemy that dissapeared before comes back in place of your copy
-Plane shift(bomb)
normal/shadow or normal/elemental damage
all the enemies in the radius of the explosion are sent to another dimension
they come back after a few seconds with the warped status effect
The "Warped" status effect
Someone becomes warped when their molecural structure is highly unstable. This usually happens when you travel between dimensions or teleport a lot. It is not dangerous as it sounds- the reported effects are transparency and inability to interract with anything. However it is not permanent as it dissapears in a few seconds just the time your body needs to adjust yourself in the new enviroment.
tl.dr your model becomes transparent and you can't do or recieve damage(become a sitting duck). Also your shield does not push back anymore.
What's the drawback? you can teleport enemies so they don't attack you or teleport yourself avoiding danger and have a chance to become invulneable and even summon a random minion to entertain the enemy. There's no actual negative effect, making this overpowered.
For example: constant bombin would be like shivermisting enemies in one place, but also adding damage.
The gun marking teleport could be used to bring enemies outside of their area(specially abusive for respawning ones or turrets). The 'copy' shadow means enemies won't attack you
A sword that teleports you could be used to run past traps and I don't consider the "can't attack but can't be damaged" a bad side effect.