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Keywords are:  'warrior skill sundering'

Skill: sunder                   Lvl 31 Warr  (28%)
                                (important)   Requires: cleave
                                Group: Warrior power attacks
                                
                                Speed: very slow

Usage:
sunder <target>

The warrior skill 'sunder' is an obscure and rarely used offshoot of the
'cleave' power attack.  A warrior can summon all of his strength and
attempt to sunder the weapon or shield of an armed opponent, destroying
it or rendering it useless. This can greatly demoralize the target as well,
whether by destruction of a weapon or shield with sentimental value or
being intimidated by a display of strength and ferocity.

Only high impact weapons, like hammers and axes, can be used for sundering
attacks.