The Elfstone 'Elessar' (+7,+7) [+10]
+2 strength, wisdom, charisma, speed. Provides resistance to fire, poison, fear. Cannot be harmed by acid, electricity, fire, cold.
When activated, it heals 500 hit points. Takes 200 turns to recharge.
Min Level 60, Max Level 127, Generation chance 2, 0.3 lbs

(Angband 3.1.2v2)