Potion of Invulnerability

From OSE SRD

The character is magically protected from harm, gaining the following benefits:

  • Armour Class: A +2 AC bonus.
  • Saving throws: A +2 bonus to all saves.
  • Usage frequency: If a character consumes more than one potion of invulnerability in the space of a week, the effects are inverted (a -2 penalty to AC and saves).