|Potion of invisibility ( ! )|
If they are cursed, however, they make everything invisible for the player - he becomes blind for a period of time. Note that the potion can be thrown at monsters for the same effect — non-cursed potions making them invisible, cursed ones blinding them. Non-immune monsters have around a 50% chance to resist this, with more experienced monsters being more likely to resist
If a monster has one in its possession (picked up from the floor), it can decide to drink it to become invisible.
Invisibility can be very helpful in many places where hordes of monsters have to be fought without a bottleneck nearby, or if you need to dive into the fray in order to seek out a particular enemy. Invisibility is, however, also available from rings of invisibility, robes of invisibility or cloaks of invisibility or the Invisibility spell.
Since blindness is such a powerful effect on enemy monsters and potions of blindness can be somewhat rare, cursed potions of invisibility can be considered more useful than their non-cursed counterparts.
They can be obtained in the same manner as all generic loot.
Greater Identify information
------------------------- blessed potion of invisibility----------------------- When used in melee combat it grants a +0 bonus to hit and causes 1d2 points of damage. When used as a missile it grants a +0 bonus to hit and causes 1d2 points of damage.