Beast of Apocalypse Template

Anung Un Rama, the beast of the end times.

Beasts of apocalypse are otherworldly creatures, summoned primarily by a rare few apocalypse magi and are the very keys to destroying all that is, was and ever be. They appear most usually as creatures of their race, perhaps with slightly more bulk and imposing features, including a large, artificial arm of undetermined material that acts as a greater weapon than most held in hand.

Creating a Beast of Apocalypse
"Beast of apocalypse" is an inherited template that can be added to to any corporeal outsider or aberration with the evil subtype(referred to hereafter as the base creature). Normally, a beast of apocalypse can only be conjured into existence by an apocalypse mage of 8th level and higher.
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Sidenote: This qualification includes half fiends, with respect to what this template is based on. This also means that whenever I myself create half-fiends they have all the alignment subtypes as their fiendish parent. Some higher level ones might even have the other subtypes, but now I'm rambling.
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A beast of apocalypse has all the base creature's statistic and special abilities except as noted here.

Size and Type
The creatures type changes to outsider. If the base creature is an outsider, than it retains its type. For aberrations with this template, recalculate BAB, saves and skill points as though it were an outsider. Size is unchanged.

Armor Class
A beast of apocalypse receives a +2 natural armor bonus, as well as a +2 shield bonus to AC granted by their improved arm(see below).

Attack
Beasts of apocalypse retains all natural weapons it had before this template, and gain a primary slam attack granted by virtue of their improved right arm. They can attack with this arm and still retain their shield bonus to AC. The slam deals damage depending on size, as shown on the table in the damage entry.

Full Attack
A beast of apocalypse can either attack with it's slam attack and an off-hand weapon, or with a weapon in it's improved arm. A beast of apocalypse cannot attack with it's slam attack and a primary weapon at the same time, but it can hold a weapon while making it's slam attack.

Damage
A beast of apocalypse's natural slam attack deals damage based on the size of the creature, as noted on the table below. It also deals an additional amount of damage equal to 1½ times it's Str modifier.

{table="head"]Size|Damage
Tiny|1d4
Small|1d6
Medium|1d8
Large|2d6
Huge|2d8
Gargantuan|3d8
Colossal|4d8
[/table]

Special Attacks
A beast of apocalypse retains all the base creature's special attacks nd gains those described below. Save DCs are equal to 10+½ beast's HD+beast's Cha modifier unless otherwise noted.

Aura of End Fire (Su): Once per day, a beast of apocalypse can invoke unholy fires from it's body. Once per day, it can invoke the aura as a standard action, and anyone within 20 feet of the beast of apocalypse is allowed to make a Reflex save one a round to avoid the damage. On a failed save, it deals 1d6 points of damage and an additional 1d6 damage for every 3 HD the beast possesses above one. On a successful save, they only take half damage. This aura lasts a number of rounds equal to half the beasts HD, rounded down, minimum one.
If the beast of apocalypse is being used with the Invoke the Apocalypse ritual, it's aura is perpetually active, whether or not it has used it's aura for the day or not and the aura cannot be suppressed.

Special Qualities
A beast of apocalypse retains all the base creature’s special qualities and gains those described below.

Apocalyptic Beast (Ex): A beast of apocalypse is quite obviously, a creature that is the harbinger of the end of times on the material plane or worse. It's improved arm is quite literally the key to summoning forth your master's otherworldly lord, the thing that will undoubtedly destroy or consume the world if not destroyed or concealed again. You are the only creature capable of being the key to the Invoke the End Times ritual of your master, though your severed arm works just as well as if it were attached to your body.

Damage Reduction (Ex):
A beast of apocalypse gains DR 10/good. If the base creature already had damage reduction overcome by good(and anything else), it'd DR instead increases by 5(to a minimum of 10).

Immunities (Ex): Beasts of apocalypse have immunity to fire and electricity.

Improved Arm (Ex): Your arm is something unknown by most scholars and even powerful magi, a material that is literally indestructible. Your arm is considered to be a manufactured weapon(even though it is a slam) in all aspects, and resistance to destruction as though it were an artifact. Your arm cannot however be enhanced magically as a weapon and in that respect is still just a natural weapon. The only thing that can destroy it is the creature which your apocalypse mage master serves to the end of times.

Resistances (Ex): Beasts of apocalypse have resistance 10 to cold and acid.

Abilities
Increase from the base creature as follows: Str +2, Con +2, Cha +2.

Organization
Most usually it is unlike creatures of it's race, and is most often merely solitary.

Challenge Rating
Same as base creature +1.

Treasure
Same as base creature.

Alignment
Usually as base creature.

Advancement
As base creature.

Level Adjustment
As base creature +2.