Skull Collector is a unique exceptional Rune Staff in Diablo II.
Although Skull Collector provides moderate bonuses to all skills, its real value lies in its mana boost as well as its magic find. At high character levels, Skull Collector can give a great bonus to the chances of getting a magic item.
Stats[]

Skull Collector
Rune Staff
Two-Hand Damage: 24 to 58
Required Level: 41
Required Strength: 25
Durability: 50
Staff class - Very Slow Attack Speed
+50% Damage To Undead
+20 To Mana After Each Kill
Increase Maximum Mana 20%
+1-99% Better Chance Of Getting Magic Items(+1 Per Character Level)
+2 To All Skills
Normal Staves — Bane Ash (Short Staff) • Serpent Lord (Long Staff) • Spire of Lazarus (Gnarled Staff) • The Salamander (Battle Staff) • The Iron Jang Bong (War Staff)
Exceptional Staves — Razorswitch (Jo Staff) • Ribcracker (Quarterstaff) • Chromatic Ire (Cedar Staff) • Warpspear (Gothic Staff) • Skull Collector (Rune Staff)
Elite Staves — Ondal's Wisdom (Elder Staff) • Mang Song's Lesson (Archon Staff)
Quest Items — Staff of Kings • Horadric Staff