Alternate Spirit Combat

The following is Lord Twigs' alternate rules for Spirit Combat.

The following should be borne in mind when spirits engage in combat in the spirit world:

Spirits attack, defend and basically fight just like their corporeal counterparts, though many of their Attributes and skills are determined differently.
Regardless of the apparent weapon used, a spiritual attack is made of the spirit’s own willpower, rather than metal or wood as a real weapon is. As such it always inflicts only its Spiritual Damage Modifier to a target (minimum of one point of magic point damage).
Armour is of no use in the spirit world and the damage of an attack will not be reduced by any apparent armour.
All spirit critical hits simply do maximum possible damage for their Spiritual Damage Modifier and fumbles are simply failed attacks.
Spirits do not suffer injuries, though they will be defeated if their magic points are reduced to zero.
Spirits do suffer from Knockback but only if the magic point damage exceeds their POW (rather than their SIZ).

Spirits attacking corporeal characters do so normally.

When attacking a corporeal creature, a spirit is still in the spirit world. It is the corporeal being’s soul that is being attacked rather than its physical form. As such, the spirit is not affected by any environmental modifiers.
Regardless of the apparent weapon used, a spiritual attack is made of the spirit’s own willpower, rather than metal or wood as a real weapon is. As such it always inflicts only its Spiritual Damage Modifier to a target’s magic points (minimum of one point of magic point damage).
Spirit attacks may be resisted with the Spiritual defense skill (INT+10).
Spirit attacks ignore armour.
Since the damage is done to a corporeal being’s soul, it is reflected in a loss of magic points instead of doing hit point damage.

Spirits are usually invisible to corporeal creatures and make no sound, though many of them have a distinct smell or sensation that accompanies their manifestation. As such, corporeal opponents unable to pierce this invisibility will take a –40% penalty to their attacks if they attempt it before a spirit becomes visible.
Corporeal creatures strike back at a spirit in exactly the same way as a spirit attacks them, using their Spiritual Attack skill (CHA+10) to hit and dealing magic point damage based on their Spiritual Damage Modifier.
Spells that cause magic point damage, or spells specifically designed to attack spirits, may also harm spirits. However, if the spell requires a target, the spellcaster must be able to see the spirit. Spells with the Touch trait will not work against spirits, unless the character is currently engaged in spirit combat with the target.