Visual
After the caster has finished the long ritual each target hears 'Anteo-cuh-lay-chee-ha', followed by each target being in a cylinder shaped void that you can't see beyond, expanding from 2 feet up too 15 feet in radius. The ground looks corrupted with some sort of plague/blight.
Functionality
In truth each target is still have not been moved, just their perception of the world has changed. Too each target everything looks like a monster/undead that steps into their little space.
For example you get hit by this spell, you are with a party of a wizard, barbarian and ranger: The wizard now looks like a undead warlock (or just simply caster), the barbarian like a huge abomination and the ranger like a skeleton wielding a bow(or what ever the ranger was wielding).
This will most likely cause the party too attack each other if they are all hit with it.
Hidden buff
In addition to the illusion the target is buffed with 'cursed strength' which causes the target to get an additional +d6 dmg on physical attacks and on all magical attacks get d6 added to the dmg as necromancy dmg (for an example an fire attack does X fire dmg +d6 necromancy dmg).
This will prevent player too catch on if they party is hit by this.
* - (A burned out candle and an eyeball per target (quality of eyeball: any, rotten included).)