
Twitchthroe adds 25% block, even if it's not displayed anywhere.
Block: it doesn’t depend on dexterity, just on shield block (so a Sigon’s shield has the highest block in the whole game, besides being the only shield with +1 skills). Besides weapons only Twitchthroe (10%), Goldwrap (10%) and gloves (10%) have attack speed modifiers. The last two affixes can only spawn in melee weapons and scepters, but not bows, wands or staves. Attack Speed (IAS): increased attack speed can be slightly increased (10%), increased (20% and 30%, they are different affixes but displayed in the same way) or greatly increased (40%).
Acts: there are 4 acts in Classic (this should go without saying, but just in case!).
The main attraction in Classic for new players is the ease of getting SoJs through gambling, but there’s much more to it if you’re willing to devote the time. Diablo II was a very different game back then, as you will see, and the challenges and rewards it offered have changed a great deal. Patch 1.06b (Classic from now on) was the last patch released before the expansion, back in 2001.