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Keywords are:  'druid skill mudwalker swampfoot'

Skill: mudwalker                Lvl 10 Drui  (28%)
                                (helpful)   Requires: unnatural spring
                                Group: Druid earth and water

The 'mudwalker' skill allows an experienced druid to partially solidify
the ground beneath their feet using earth magic.  This greatly reduces
the effort required to navigate swamps, and the mana cost is generally
small enough to not be noticed except in extreme situations.

This skill is used automatically when you are in swamps and marshes.