Some targets on the battlefield may drop special items or tokens. They grant useful bonuses when cubed with the class charm you picked up in Kurast 3000 BA. Refer to the UBERLEVELS page if you do not have it yet.
In Terror and Destruction difficulty, you can find veteran monsters near the end of each Act. There are 5 types of veteran monsters, one for each Act. Kill them on Terror difficulty to receive an 'Evil Eye' token.
Cube your class charm with five tokens to receive additional bonuses.
Act 1 : Clawstorm Terror
Act 2 : Fairy Witch
Act 3 : Glowing Blob
Act 4 : Landmass
Act 5 : Bane Hunter
This upgrade recipe adds the following bonuses:
+1 to [Your class] Skill Levels
+20% to Experience Gained
ACT BOSS TOKENS
On Terror or Destruction difficulty, kill Act bosses to receive a 'Dogma' token. Collect each of the five tokens, plus two extra tokens corresponding to one of the Prime Evils (Mephisto, Diablo or Baal).
Then cube the tokens to receive a Signet of Skill. The Signet can be consumed to gain 1 skill point. You can only use 3 of these signets on any given character.