Unholy

Unholy is an attribute of objects, energies or characters. Unholiness is most closely associated with Dark but is not exclusive to it. Unholiness comes with a connotation of corruption, destruction, sin, malevolence, chaos and being forsaken by the divine.

Some attacks will count as unholy, and thus have the Unholy modifier. In the stat system, they will typically deal 50 extra damage compared to a mundane version of the same attack, increased to 100 extra damage against Holy enemies. For example, a strong sword slash might deal 200 damage. The same sword made with unholy material will inflict the same wound, but also deal direct damage to the opponent's lifeforce, dealing 250 damage in total. Use it against an angel or paladin, and it will wither some of their holy essence as well, dealing 300 damage in total! Remember that some characters may have more weaknesses or take even more damage from unholy energy, though this is on the part of the character's creator to determine. You might also choose to give your unholy attack/ability more effects than just a damage increase compared to a modified version, including even more damage or effects against the holy.

There are numerous creatures which count as innately unholy. These include demons, vampires and werewolves.

Unholy Magic
Unholy magic is a group of spells which aren't restricted to any specific kinesis. Several of these abilities can be innately developed by unholy beings, or learned through study by neutral races like humans.
 * Projecting unholy darkness. Not enough to do any sort of harm, except possibly against the holy.
 * Cause Light Wounds, a damaging spell. Fairly weak in comparison to actual damage abilities.
 * Curse, applying a slight debuff to an enemy.
 * Detecting when something is holy or unholy. (One wouldn't be able to tell specifics, like the exact species of something which seems visually totally human, or the particular powers of an item. Just able to identify the attribute.)
 * Fear, causing some innate fear in a foe to lessen the power of the mind.

On Player Use
Players may wish to use Unholy abilities for any number of reasons, usually justified through a character's lore. Readers may get the impression that all players will tend toward making all their attacks Holy or Unholy since they're stronger than neutral versions of the same attack, but bear in mind that all such upgrades are opportunity costs. If you've gained an upgrade, you could use it to turn the fire you use for one of your attacks into hellfire, increasing its damage by 50, up to 100 against the Holy. But you could also use that upgrade to instead just increase the temperature of the fire itself, increasing its damage by 75 against all enemies. And both of these have an opportunity cost compared to just increasing a character's durability or speed, or unlocking new abilities.

This is to say: just like for any other sort of power, don't feel pressure to use it for strength optimization purposes, since it's not necessary to make your character stronk. Opt for it only if you feel it fits your character.