If you took a glance at Infinity's stats, you'd probably realize that a lot of the mods are incredibly useful. However, if you then take a look at the Runes required and what item you can create the Runeword in, you'd be disappointed; the Infinity Runeword can only be used in Polearms. Almost no Diablo 2 players would be caught dead using a Polearm, even an Amazon (who has Skills that help out when using javelins and polearms), due to the fact that while Polearms deal out a lot of damage, they are also slow weapons, and require the use of two hands, which sacrifices the use of a Shield, which many players find a necessity due to the chance of blocking enemy attacks.
However, there is one character that can only use Polearms as a weapon and cannot use Shields: The Mercenary from Act II. The cost of making Infinity for yourself is already exorbitantly high due to all four of the Runes required being extremely rare Runes, but making it for a meager Mercenary seems beyond astronomical. However, if you are that wealthy and have those runes to spare, why don't we see what Infinity has to offer?
4 Socket Polearms
Runes (in order): Ber + Mal + Ber + Ist
Level Requirement: 63
50% Chance To Cast Level 20 Chain Lightning When You Kill An Enemy
Level 12 Conviction Aura When Equipped
+35% Faster Run/Walk
+255-325% Enhanced Damage (varies)
-(45-55)% To Enemy Lightning Resistance (varies)
40% Chance of Crushing Blow
Prevent Monster Heal
+0.5-49.5 To Vitality (+0.5 Per Character Level)
30% Better Chance of Getting Magic Items
Level 21 Cyclone Armor (30 Charges)