Potion of restore ability

Quaffing effects
If the potion hits a monster, it is restored to maximum hit points.

If you breathe its vapors, the effects are as for quaffing.

Identification
This potion is completely safe to quaff, even if the BUC status is unknown.

Strategy
The effects of this potion are completely superseded by a unicorn horn, the only difference being that this potion is 100% reliable, whereas even a blessed unicorn horn has a chance of doing nothing. It is therefore a prime candidate for dilution.