| Size / Type | Diminutive Animal (Evil) |
| Hit Dice | 1d8 (4) |
| Initiative | +4 (Dex) |
| Speed | 30 ft. climb 30 ft |
| Armor Class | 18 (+4 Dex, +4 Size) |
| Attacks | Bite +8 melee |
| Damage | Bite 1d3-4 |
| Face / Reach | 1.25ft by 1.25ft / 0ft |
| Sp. Attacks | Spells |
| Sp. Qualities | Group mind, scent, outsider |
| Saves | Fort +2* | Ref +6* | Will +1* |
| Abilities | Str 02 | Dex 18 | Con 10 | Int 1* | Wis 12 | Cha 2 |
| Skills | Balance +12, Climb +12, Hide +20, Move Silently +12 |
| Feats | Weapon Finesse (bite) |
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| Climate | Outer Planes |
| Organization | Pack (3-30) |
| Rating (CR) | 1/2 |
| Treasure | Half coins, no goods, no items |
| Alignment | Always Neutral Evil |
| Advancement | None |
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Group Mind (Su): Each Cranium rat is automatically in telepathic contact with each other in a 10 feet radius. For every 5 rats in such communication they generate 1 point of intelligence (Int 1 for 1 to 4 rats;2 for 5 to 9 and so on). The pack of rats counts as a creature with as many HD as Intelligence they have (a 30 pack saves as a 6 HD creature, and for example, are immune to sleep because they have more than 4 HD). Also area effects kills as many rats as HD has the spell (a 8-HD fireball kills 8 rats if the save is failed, or 4 if the save is made).
Spells (Sp): The pack of Cranium rats gain spells depending upon his intelligence, following the next table (the entries listed in italics are accumulative, but only the best of each category remains).
| Intelligence | Ability | | 1-6 | Standard | | 7 | 1 spell level of wizard spells | | 8 | 2 spell levels of wizard spells | | 9 | Mind Blast, 1 every 3 rounds | | 10 | 3 spell levels of wizard spells | | 11 | 4 spell levels of wizard spells | | 12 | Mind Blast, 1 every 2 rounds | | 13 | 5 spell levels of wizard spells | | 14 | 6 spell levels of wizard spells | | 15 | Mind Blast every round | | 16 | Immune to gases | | 17 | Immune to cold | | 18 | SR 13 | | 19 | SR 19 | | 20 | SR 25 |
Spells are cast as a sorcerer of equal levels to Intelligence of the pack - 6. The DC is calculated according to Intelligence, and they ignore the ability requirements to cast some spells (such as Int 12 to cast second level spells).
Outsider: Darkvision 60 feet, and can’t be raised or resurrected.
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