Spell Books are weapons that deal magic damage and are dependent on mana. They don’t use ammunition, which is why mana regen is essential if you opt for this weapon, similar to Wands. Overall, nine Spell Books are in the Dungeons, including the Water Bolt. They are Book of Skulls, Cursed Flames, Demon Scythe, Crystal Storm, Lunar Flare, Golden Shower, Razorblade Typhoon, Magnet Sphere and Water Bolt.