Moderate HP pool, low armor, moderate attack, high chance of poison on hit. Be aware, spiders are faster than most player characters and if encountered with low AC can kill a player quickly. Appears in mine levels, and frequently in the swamp levels. There is also a spider with twice as much health named Shelob, similar to Algernon in the way that there is almost no physical difference except for the health and damage. Shelob drops Magic Sword and a -5 Ring of Invisibility.
"Avoid these nasty little critters like the plague! They'll run at ya fast-like, and are always angry, and will attack when they see ya! My tactic is to hit them til they die, and it usually works. So try that! But make sure ya do kill em, because they can outlast most other critters in the mines." ~Shopkeeper Joe
Spiders don't drop anything.