TEXT: 16
  BLOODMAGE
  Blood mages are priests of Chaos, twisting
  and corrupting the laws of the natural world
  to meet their own whims and desires. They
  know of the gods and the rules they’ve set,
  but worship them only insofar as that gods
  are capable of creating such laws while
  blood magic can only bend and break what
  is already written.
  Alignment: Blood mages know the
  underlying rules of Law that the world
  depends on to function. Their ritual magics
  break these conventions and bend the will
  of the multiverse to their own. Casting a
  blood magic ritual is an inherently Chaotic
  act, thus attracting those aligned as such.
  RapidRegeneration
  Blood mages of 7th level and above have
  learned to weather the effects of their
  frequent bloodletting. They regenerate HP
  at twice the normal rate during periods of
  rest.
  Combat
  The need for dexterity in their casting
  rituals forbids the use of shields, metal
  armor, or any two-handed weapons outside
  of crossbows.
  Ritual Magic
  Through ritual casting, blood mages are
  capable of performing magic through the
  sacrifice of their own life energy. Due to
  their intricate nature, rituals are not
  normally able to be cast during combat.
  Ritual casting: Each ritual requires a
  word or phrase of power that must be
  chanted in the druidic tongue such as
  “Heal,” “Tame animal,” “Energy shield,”
  “Blessed hammer,” “Song of silence,” “Fire
  mastery,” or “Hermephrotep, God of
  Wonderment.” The effects and costs of
  the ritual vary depending on the specified
  wording of the ritual, the situation at
  hand, and a per-case agreement between
  the player and Referee.
  Ritual costs: Each ritual has an HP cost
  that the Referee decides. HP lost to ritual
  magic cannot reduce the character to
  negative HP, nor can it be regained except
  by resting. In addition, extremely
  powerful rituals require a save vs. spells
  to cast. If a 20 is rolled on this save the
  character is reduced to zero HP and the
  ritual has some unintended catastrophic
  effect of the referee’s choosing. The
  player can negotiate a lower cost by
  including things such as a rare ingredient,
  extra casting time, detrimental effects,
  etc.
  Ritual slots: Blood mages gain slots for
  rituals and permanently choose two
  rituals per slot, one that is active and one
  that is not. Switching rituals into slots
  takes a day of study, concentration, and
  preparation.
  MagicResistance
  Blood mages gain a +2 bonus to saving
  throws against spells and mind
  influencing abilities.
  Requirements: None
  Prime requisite: WIS
  Hit Dice: 1d6
  Maximum level: 14
  Armor: Leather
  Weapons: Any one-handed, crossbow
  Languages: Alignment, Common, the
  secret druidic tongue
  
  17
  AfterReaching11th Level
  Abloodmagemaystartacoven,ofteninthe
  deepestdepthsofaruinedtowerorcleared
  cavern.1d6apprenticesoflevels1–3willthen
  arrivetostudyunderthebloodmage,alongwith
  1d4sacrificiallambswillingtooftertheirblood
  inthenameofritualmagic.
  Blood Mage Level Progression
  Saving Throws
  RitualSlots
  Level
  XP
  HD
  THAC0 D
  W
  P
  B
  S
  1
  0
  1d6
  19 [0]
  11
  12
  14
  16
  15
  2
  2,000
  2d6
  19 [0]
  11
  12
  14
  16
  15
  3
  4,000
  3d6
  19 [0]
  11
  12
  14
  16
  15
  4
  7,500
  4d6
  19 [0]
  11
  12
  14
  16
  15
  5
  12,500
  5d6
  17 [+2]
  9
  10
  12
  14
  12
  6
  20,000
  6d6
  17 [+2]
  9
  10
  12
  14
  12
  7
  35,000
  7d6
  17 [+2]
  9
  10
  12
  14
  12
  8
  60,000
  8d6
  17 [+2]
  9
  10
  12
  14
  12
  9
  90,000
  9d6
  14 [+5]
  6
  7
  9
  11
  9
  10
  125,000
  9d6+1*
  14 [+5]
  6
  7
  9
  11
  9
  11
  200,000
  9d6+2*
  14 [+5]
  6
  7
  9
  11
  9
  12
  300,000
  9d6+3*
  14 [+5]
  6
  7
  9
  11
  9
  13
  750,000
  9d6+4*
  12 [+7]
  3
  5
  7
  8
  7
  14
  1,500,000
  9d6+5*
  12 [+7]
  3
  5
  7
  8
  7
  * Modifiers from CON no longer apply.
  1
  2
  2
  3
  3
  4
  4
  5
  5
  6
  6
  7
  7
  8
  D: Death / poison; W: Wands;
  P: Paralysis / petrify; B: Breath attacks;
  S: Spells / rods / staves.
  
SOURCE: textdata/thevault/Old-School Essentials BX Essentials/Old-School Essentials Supplements/Old-School Essentials Classes/Blood Mage (OSE).pdf