The Bestiary/Catacomb Creatures

Enter "An Abandoned Shack" at 5,4. Go through the trapdoor.
To find the majority of the Giant Spiders and Spidra Arcana, try going as north east as you can.
You'll find a chasm, enter it.
(UPDATE: there is a portal that takes you there directly at 11,13 - Backward Lane)

Catacombs Map

Bat

Creature Statistics: Bat
Description: This is a small black bat with leathery wings and razor-sharp teeth.
HP: 5
XP: 5
Karma Change: 0
Physical Resistance: 2-4
Magical Resistance: ???
Life Supply?: yes
Base Damage: 1-4
Coins Dropped: 5
Items Dropped: Bat Pelt
Location: Catacombs, Chasm
Other Information:

Giant Spider

Creature Statistics: Giant Spider
Description: This is a giant, hairy spider.
HP: 8
XP: 8
Karma Change: 0
Physical Resistance: 1-3
Magical Resistance: ???
Life Supply?: yes
Base Damage: 3-5
Coins Dropped: 7
Items Dropped: Giant Spider Fang
Location: Catacombs, Chasm
Other Information:

Gorgon

Creature Statistics: Gorgon
Description: This brutish female creature seems more serpent than humanoid. The long powerful tail and leathery wings pale in comparison to the writhing nest of vipers on its head.
HP: 55
XP: 29
Karma Change: +2
Physical Resistance: 1-5
Magical Resistance: ???
Life Supply?: no
Base Damage: 5-7
Coins Dropped: 10
Items Dropped: Gorgon Blood, Gorgon Head, Gorgon Skin
Location: Catacombs, Chasm
Other Information:

Subterranian Rat

Creature Statistics: Subterranian Rat
Description: This is a tremendous rodent with dark fur and large eyes. It has become highly adapted to living beneath the soil.
HP: 15
XP: 7
Karma Change: 0
Physical Resistance: 0-2
Magical Resistance: ???
Life Supply?: yes
Base Damage: 3
Coins Dropped: 4
Items Dropped: Giant Rat Pelt, Giant Rat Tooth
Location: Catacombs, Chasm
Other Information:

Game Information The Bestiary • Character Stats • Classes • Deities• Graveyard • Guilds • History Items • Categorized Items • Retired Items •Custom Items •Known Bugs • Library • Locations • Scrolls Shop Types • Skill Tree •Sorted Clothing • Spellbook • Suggestions • To Do List • Upgrading World Map • Version History • Your Character