For mortals, assume the snake's venom is save vs poison or die. Against elephants, gods, giants, or other beings who make sense the snake venom just deals 2d6 damage. The snake can aim for weak points but naturally cannot bite through metal armors. Enemies can also cut off the snake's head with a slicing weapon; requires a successful to-hit roll at -4
The pitchfork gets +1 to hit per Seven Deadly Sin the target is guilty of. The pitchfork deals 1d6 damage per Seven Deadly Sin the target is guilty of.
The manuscript also grants its holder the full set of Cleric spells of a 9th level Cleric- and that many casts per day. Every spell must be cast by opening the book and reading a prayer for a full round. It is also a holy symbol +3 and turns undead as though by a 12th level Cleric, if such a thing even exists in your game. Just assume it turns everything except the Devil himself, basically. The Domain of the Cleric spells is random, but based on whatever the holy book is about. The full accounts of a Sea God's great journey across the ocean, the private diary of the Goddess of Love, or the lists of laws and tax codes for the God of Order could also be picked up and used as holy manuscripts with these same powers and abilities; if you managed to get them.