I'm a bit unsure about a part of the spell description. Specifically what happens when the target/s succeeds on their saving throw.

Psychic Crush says

As an action, you create a 20-foot cube of psychic energy within 120
feet of you. Each creature in that area must make an Intelligence
saving throw. On a failed save, a target takes 8d8 psychic damage and
is stunned until the end of your next turn. On a successful save, a
target takes half as much damage.

Is the target stunned if it succeeds on its saving throw?

For example:
Let's say I cast psychic grip on a 2 targets. The first target fails his saving throw and is both stunned and take full damage. The second target succeeds on his saving throw and only takes half damage. But is he stunned?

The text just says that he takes half damage, but doesn't specifically say whether or not he is stunned.

Edit 2 – So I was looking through the other disciplines and found this: Venom Strike (1–7 psi). As an action, you
create a poison spray that targets one creature
you can see within 30 feet of you. The target
must make a Constitution saving throw. On a
failed save, it takes 1d6 poison damage per psi
point spent and is poisoned until the end of your
next turn. On a successful save, the target takes
half as much damage and isn’t poisoned.

Venom Strike follows the same basic structure that Psychic Grip does, but unlike Psychic Grip, the last sentence clarifies that the "side effect" does not occour on a successful save. This would indicate that side effects do take place on successful save, unless otherwise specified. I still doubt that this is the intended reading.