Combating the Spirits (SB)

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Sooner or later, player characters will undoubtedly find themselves opposing a spirit so angered that they are facing it in a "kill-or-be-killed" situation. Some hints were provided in the Introduction as to how a spirit might be attacked. Now, here's the truth and all the details.
==Using Magic Against the Spirits==
Most priestly and wizardly magics, have little effect on the spirits. Priests' and wizards' spells that affect creatures of a specific alignment also work against spirits (assuming that the target spirit is of the correct alignment and the spell affects sentient creatures). Spells that restrict, protect from, or harm extraplanar creatures appear to have no effect on spirits.
Spirits are not affected by spells and powers that combat undead, they are neither "people" nor animals (for the purposes of charm and hold spells), and can be damaged by weapons and spells only when they choose to take on physical form.
The spells that affect them the most efficiently are the shamans' spells detailed in Chapter Three.
==Weapons Effective Against Spirits==
Mundane weapons have no effect on spirits, and enchanted weapons are weaker against them than real creatures. (After all, killing a thought with a sword is an exceedingly difficult thing to do unless one kills the thinker.) In the case of spirits, killing the thinker is impossible, since they are often created by the collective thoughts of hundreds. In terms of play, for each 4 Hit Dice a spirit has, the magical weapon must be of an additional +1 in rating. (A sword +1 is effective against a 1- Hit Die spirit, but a mace +2 is needed against a 3- Hit Die spirit, and an +4 or better weapon is needed to injure an 8-Hit-Die spirit. The most effective weapons against spirits are the spiritknives created by solitary shamans. They deal permanent damage to any spirit of any power level.
=="Killing" Spirits==
A spirit which manifests itself on the physical plane may lose Hit Points. Once these are reduced to 0 the spirit is "killed" (destroyed), and its physical corpse dissipates. However, shamans know that some or all spirits can return again, unless the are slain with a spiritknife created by solitary shamans.
Unless the mortals who believe in the spirit's existence are told of its destruction (and believe the report, thus no longer believing in the spirit), the spirits are recreated by their belief in the space of 1d10 days. They reform as 1-Hit-Die spirits, but recover other lost Hit Dice at a rate of one per two full months until they have grown back to their original powers.