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Keywords are:  'plague doctor bonus class taintblood corrosive orb rain cauldron born immunity'

The plague doctor class is available during certain Halloween Havocs
and Fall Festivals.  It is centered around alchemical abilities gifted
by the demon lord Chalchiuhtotolin. The skills and spells help players
to stave off the effects of diseases and combat undead.

It is a bonus class with five levels.  Each level unlocks the following
abilities:

Level 1 - 'taint blood' - You taint your blood with acid. This
acid is harmless to living creatures, but any undead creatures that
wound you are burned by it, especially if they bite you.

Level 2 - 'corrosive orb' - You pull some of the acid from your
blood and hurl it at an enemy. Upon exposure to the air, it increases
in potency and can harm living creatures in addition to undead. You
must have taint blood active to use this spell, and each casting
reduces the duration of the taint blood spell until it expires.

Level 3 - 'cauldron born' - You can combine alchemical
ingredients to create an animated slime minion. While not very durable,
a cauldron born has highly damaging acid attacks. A cauldron born
is brewed like a potion, using spellcomps and herbs. Higher level
components result in more powerful cauldron borns. Use 'brew slime'
to create a cauldron born.

Level 4 - 'plague immunity' - As long as you have taint
blood active, you are immune to all diseases.

Level 5 - 'acid rain' - You pull some of the acid from your
blood and hurl it over a group of enemies, where it rains down
upon them. Like corrosive orb, once the acid is exposed to air, it
becomes effective against both the living and the undead. It also
requires taint blood to be active and lowers its duration.