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Keywords are:  'druid tonic sundrinker drinker'

The 'sundrinker' tonic is drunk, and gives the user the ability
to regenerate more quickly in the presence of sunlight.  It tinges
the skin a deep green color.

Sundrinker also reduces the duration of light blindness, and can
reduce the impact of sunlight based attack spells.

A creature cannot be the subject of both winterkin and sundrinker
at the same time.