Numbness is a Hex in Dark Souls 2. To cast a Hex, you must use a staff/chime or Special Weapons that can cast Hex.
"A hex that transforms its caster's flesh. Temporarily reduces receive damage, but darkens one's sight.
If it cannot be observed, it does not exist. Certainly a common conception, but one with far too many exceptions in this world.
- Reduces all incoming damage by 35% for 20 seconds, however it will give the player tunnel vision by darkening the sides of the screen. With the changes to spell duration and stats made to this spell, Numbness can last up to 90 seconds.
- This Hex also darkens the blinding mist within the "Crown of the Ivory King" dlc making certain areas easier than they were designed to be.