Jaws of Fenrir

The original ultra-powerful version:

Jaws of Fenrir (Major) by Stone Gargoyle

The superbeing is able to cause an eclipse, blocking solar energy and creating the illusion that the sun is being eaten.

1. Blocking Out the Sun: The superbeing can initiate an eclipse by slightly altering the course of the moon, but doing so in such a way that damage from the actual movement from the moon itself is minimal. This will create some tidal waves and flooding, and everyone on the planet must save vs. psionic attack to fight the effects of the onslaught of lunar energy (14 or better, ME bonus applies) or suffer mood swings for the duration of the power, suffering -2 to all combat moves and -15% to skill performance.
Those within range of the character's power suffer additional effects. If looking directly at the sun when the eclipse occurs, victims will take 1d4 points of damage to Hit Points and be permanently blinded (loss of initiative, reduced to half attacks, -10 to all combat moves). The onset of the eclipse takes one full minute, during which time there is still enough natural light to see. If looking in the direction of the sun but not directly at it, it will appear to onlookers as if the sun is being swallowed by an enormous wolf, though onlookers may save vs. illusion to disbelieve it (14 or better, +1 at levels 4, 8 and 12, ME bonus applies). If failing their save, the onlookers must then save vs. Horror Factor (16 or better, ME bonus applies) or react in terror. The temperature in the effective range will also drop by 20 degrees Fahrenheit.

Range: The illusion and blinding and darkness effects only affect those within a radius of his ME number in miles around the superbeing.

Duration: The eclipse will last the superbeing's ME number in minutes. The onset of the eclipse is one minute during which the illusion part takes place, with the rest of the duration suffering darkness.

Penalties: The unnatural darkness causes blindness (-8 to all combat moves, loss of initiative and reduced to half attacks). Note that artificial light will still work and offset penalties for blindness due to the darkness.

Attacks: Initiating this power uses 2 melee attacks/actions to initiate and one attack/action per melee round to maintain.

Note: The superbeing will be unaffected by the effects of this power, able to see normally during the eclipse.

2. Deity Negation: All godlike beings (Immortals of the Godling, Avatar, Demigod and Fallen Demigod and Godling subcategories) lose their attribute bonuses, superabilities and other bonuses if in the effective radius of this power for the duration of the eclipse, during which time they are no longer immortal and can be killed as easily as any human.

3. Limitations: The power can only be used within 3 days of an actual eclipse (which typically take place in the lunar cycle on the date of the New Moon and Full Moon) and only twice per lunar cycle (once on the New Moon and once on the Full Moon).

4. Other Abilities and Bonuses:

+1d4 ME

+4 to save vs. Horror Factor

My attempt to tone the power down considerably:

Jaws of Fenrir - Revised (Major) by Stone Gargoyle

The superbeing is able to simulate an eclipse, blocking solar energy and creating the illusion that the sun is being eaten.

1. Blocking Out the Sun: The superbeing can appear to initiate an eclipse, but actually only blocks the light from the sun within a limited range.
Those within range of the character's power suffer the following effects: If looking directly at the sun when the "eclipse" occurs, victims will take 1d4 points of damage to Hit Points and be permanently blinded (loss of initiative, reduced to half attacks, -10 to all combat moves). The onset of the eclipse takes one full minute, during which time there is still enough natural light to see. If looking in the direction of the sun but not directly at it, it will appear to onlookers as if the sun is being swallowed by an enormous wolf, though onlookers may save vs. illusion to disbelieve it (14 or better, +1 at levels 4, 8 and 12, ME bonus applies). If failing their save, the onlookers must then save vs. Horror Factor (16 or better, ME bonus applies) or react in terror.

Range: One mile per level of experience

Duration: The eclipse will last the superbeing's ME number in minutes. The onset of the eclipse is one minute during which the illusion part takes place, with the rest of the duration suffering darkness.

Penalties: The unnatural darkness causes blindness (-8 to all combat moves, loss of initiative and reduced to half attacks). Note that artificial light will still work and offset penalties for blindness due to the darkness.

Attacks: Initiating this power uses 2 melee attacks/actions to initiate and one attack/action per melee round to maintain.

Note: The superbeing will be unaffected by the effects of this power, able to see normally during the "eclipse".

2. Deity Negation: All godlike beings (Immortals of the Godling, Avatar, Demigod and Fallen Demigod and Godling subcategories) lose their attribute bonuses, superabilities and other bonuses if in the effective radius of this power for the duration of the "eclipse", during which time they are no longer immortal and can be killed as easily as any human.

4. Other Abilities and Bonuses:

+1d4 ME

+4 to save vs. Horror Factor