Illusionist
An Illusionist is a form of Specialist Wizard in Dungeons & Dragons. Practicing the school of Illusion, the magic of altering perceptions and playing upon the mind (which, alongside Enchantment, is one of the schools that most overlaps with psionics), Illusionists are actually the oldest specialist caster in the game - way back in OD&D, they were an entirely separate class to the original Magic User.
Like Enchantment, Illusion suffers heavily in 3rd edition because practically every other monster in the game is immune to it.
5th Edition's Arcane Tradition
Illusionists are simple but effective, focusing on super-charging their illusions in various ways. At level 2, thanks to Improved Minor Illusion, not only do they get the Minor Illusion cantrip for free (or a bonus cantrip, if they already knew it), but now they can make both sounds and images in one casting of Minor Illusion. Their level 6 feature, Malleable Illusions, lets them reshape their illusion effects on the fly. Illusory Self, their 10th level feature, gives them the power to force an auto-miss on an enemy attacker once per day by using a reaction to make a one-shot illusory double take the hit for them. Finally, their most potent ability is the level 14 trait of Illusory Reality, which lets them make aspects of their illusions real for a short time. Say, making an illusion of a bridge over a chasm that you and your buddies can run away over, but which will drop anyone else straight through it, Looney Tunes style. Some DMs may actually agree to interpret this ways that're even more powerful, such as using it to create expensive spell components or to defeat enemies by encasing their weapons (or bodies!) in blocks of "faux-real" stone.