Fiendish

Fiendish creatures dwell on the lower planes, the realms of evil, although they resemble beings found on the Material Plane. They are more fearsome in appearance than their earthly counterparts.
Fiendish creatures are often mistaken for half-fiends, more powerful creatures that are created when a fiend mates with a noncelestial creature, or through some foul infernal breeding project.

CREATING A FIENDISH CREATURE

“Fiendish” is an inherited template that can be added to any corporeal aberration, animal, dragon, fey, giant, humanoid, magical beast, monstrous humanoid, ooze, plant, or vermin of nongood alignment (referred to hereafter as the base creature).
A fiendish creature uses all the base creature’s statistics and abilities except as noted here. Do not recalculate the creature’s Hit Dice, base attack bonus, saves, or skill points if its type changes.
Size and Type: Animals or vermin with this template become magical beasts, but otherwise the creature type is unchanged. Size is unchanged. Fiendish creatures encountered on the Material Plane have the extraplanar subtype.
Special Attacks: A fiendish creature retains all the special attacks of the base creature and also gains the following special attack.
Smite Good (Su): Once per day the creature can make a normal melee attack to deal extra damage equal to its HD total (maximum of +20) against a good foe.
Special Qualities: A fiendish creature retains all the special qualities of the base creature and also gains the following.
Darkvision out to 60 feet.
—Damage reduction (see the table below).
—Resistance to cold and fire (see the table below).
—Spell resistance equal to the creature’s HD + 5 (maximum 25).
If the base creature already has one or more of these special qualities, use the better value.
If a fiendish creature gains damage reduction, its natural weapons are treated as magic weapons for the purpose of overcoming damage reduction.
Abilities: Same as the base creature, but Intelligence is at least 3.
Environment: Any evil-aligned plane.
Challenge Rating: HD 3 or less, as base creature; HD 4 to 7, as base creature +1; HD 8 or more, as base creature +2.
Alignment: Always evil (any).
Level Adjustment: Same as the base creature +2.

Hit Dice Resistance to Cold and Fire Damage Reduction
1–3 5
4–7 5 5/magic
8–11 10 5/magic
12 or more 10 10/magic

Fiendish Creatures

Name CR Notes
Fiendish Dire Rat 1/2 From MM1
Fiendish raven Summoned by Summon Monster I
Fiendish monstrous centipede, Medium Summoned by Summon Monster I
Fiendish monstrous scorpion, Small Summoned by Summon Monster I
Fiendish hawk Summoned by Summon Monster I
Fiendish monstrous spider, Small Summoned by Summon Monster I
Fiendish octopus (Aquatic) Summoned by Summon Monster I
Fiendish snake, Small viper Summoned by Summon Monster I
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