"SHIELD OF THORNS"

Usage:         cast 'shield of thorns'
Cost:          60 mana
Level:         Druid 33 (Prime)
Duration:      Casters level
Accumulative:  -
Save Versus:   -
Damage Type:   -
Stratum:       Summoning 
Spellbook:     A book of crested brambles
Prerequisite:  -
See Also:      -

When Necromancer Xenobius invented his 'bone armor', his mortal enemy,
Archdruid Dendre opposed him with his own masterpiece, 'shield of
thorns'.  This spell causes flexible vines to entwine the druid's
body.  Unfortunately, unlike bones, the vines aren't rigid enough
to provide the caster with additional armor.  However, Dendre did
succeed in making the vines grow wicked, sharp thorns, each at least
a half foot long.  The vines do provide some extra protection, as
they are able to take up some amount of damage - they are very tough
to cut indeed.

Fearing that the spell will be plagiarized by his rivals, Dendre
installed druid-only checks in the spell.  Nobody non-druid has been
able to pass the checks insofar.

Necromancer Xenobius's comment was concise: Look! A walking cactus!