Invulnerability 1: Lycanthrope's jawbone, Guideline Purchasing Price: 25GP
Invulnerability 2: Ghoul's skull, Guideline Purchasing Price: 50GP
Invulnerability 3: Gargoyle's horn, Guideline Purchasing Price: 100GP for a pair
Elementalist Invulnerability Spell with a Throw giving a minimum of the type of Invulnerability required
Guideline Purchasing Price: 30 / 60 /100 GP for Invulnerability 1 / 2 / 3
Invulnerability gives the following effects:
Invulnerability 1: invulnerable to non-magical attacks, vulnerable to silver & magical attacks, other beings with Invulnerability 1 are vulnerable to it
Invulnerability 2: invulnerable to non-magical attacks, silver attacks do half damage, vulnerable to magical attacks, other beings with Invulnerability 2 are vulnerable to it
Invulnerability 3: invulnerable to non-magical and silver attacks, vulnerable to magical attacks, other beings with Invulnerability 3 are vulnerable to it
For further details see the Notes to the Elementalist Invulnerability Spell.
It does not give +s to Saving Level, or any other effects which might be connoted by the word "Invulnerability".
Duration (non-Extendable) is 9 + d6 min (i.e. 10-15 min)