Causes the target to lose grip on reality, inflicting penalties to Aim [-25], Will [-25], and mobility, and doing 5 base damage. Robotic units are immune. Lasts 3 turns. 1 turn cooldown.
From the Xcom wikia.These are values from the vanilla version,but the aim and will debuff are still correct for long war(can confirm this myself).The only thing that has changed in Long War is that damage is down from 5 to 1 and the reduction of area-of-effect range,for which I don't know any values.
There is no mention of the actual mobility reduction either,but by testing myself I've found it to be a 50% slow.I could verify this by reading some posts in the subreddit some time ago.
If I were to make a new tooltip it would read:
Causes the target to lose grip on reality, inflicting penalties to Aim [-25], Will [-25], area-of-effect attack range[whatever], and mobility[-50%], and doing 1 base damage. Robotic units are immune. Lasts 3 turns. 1 turn cooldown.