Chaos: Weapon Rune Word - Diablo 2
Chaos is an Assassin only Weapon Rune Word which grants the Whirlwind Ability amongst other benefits. Assassin's have a whole build built around this Rune Word called Wwsin but that build is mostly PvP focused rather than PvE. Unless you are specifically doing a Wwsin spec it's recommended that you pick a better Rune Word for your Assassin as there is better out there.
Keep in mind that all Rune Words you create will retain any pre-existing bonuses found on the item. If you find a 'Superior' piece of armor with +Enhanced Defense, a Superior Weapon with +Enhanced Damage or a Helm/Weapon that has +Skill bonuses for a certain class, all of these will remain on the final Rune Word that is created. It's also possible to 'ebug' a piece of Ethereal Armor that you find which will increase the Defense bonuses by 50%, check out my Ebugging Guide for more information.
Farming High Runes: Out of all locations in the game one stands above the rest for farming specifically High Runes, the Countess during Act 1. The Countess has a guaranteed chance to always drop a High Rune and can even drop more than one. Check out my The Countess Farming Guide for more information.
Required Runes: Fal -- Ohm -- Um
Level Req: 57
Other Req: N/A
Slots: Claws Only
9% Chance To Cast Level 11 Frozen Orb On Striking
11% Chance To Cast Level 9 Charged Bolt On Striking
+35% Increased Attacked Speed
+240-290% Enhanced Damage (varies)
Adds 216-471 Magic Damage
25% Chance of Open Wounds
+1 To Whirlwind
+10 To Strength
+15 Life After Each Demon Kill
Chaos Rune Word in Ethereal Runic Talons.