Ninja

• They can see objects in darkness.
• They are subject to hit with good hit.
• They hit with large damage if the monster is sleeping or in fear.
• If a hit is coup de main, it always hits.
• If they wield suitable weapon and don't equip shields, they sometimes hit very critically(the damage is half of the enemy's HP or kills a enemy with single hit.)
  (Unique monsters cannot be killed by this way.)
• If they are in darkness, they have superstealth.
• High level ninja can throw objects quickly.
• When they throw an Iron Spike or a weapon which is suitable for throwing, to dam and to hit is increased.
• Quick Walk(level 20, cost 0, Dex).
• If their armours are heavy, their speed are decreased by lvl/10.
• If their armours are heavy, their stealth are decreased by lvl/10.
• If their armours are not heavy and they don't equip shields, their speed are increased by lvl/10*3. (if they are Klacons, Sprites or Munchkin, their speed increased by 3 instead.)
• If their armours are not heavy and they don't equip shields, their stealth are increased by lvl/10.
• If their armours are not heavy and they don't equip shields and their level is 25+, they have free action.
• If their they don't equip shields, their AC is increased by lvl/2+5.
• They have slow digestion and resistance of fear.
• They gains resistance of poison at level 20.
• They gains sustain Dex at level 25.
• They gains see invisible at level 30.
• They gains double resistance of poison at level 45.
• The to hit and to dam bonus of armours are half.
• If they wield unsuitable weapon or equip a shield, to hit is decreased by 40 and their Blow/Round is half.
• If they wield suitable weapon with single hand and don't equip shields, to hit is increased by 5+lvl/5
• The reward of the old castle quest is The Amulet of The Pitch Dark Night.

• Create Darkness
  level1, cost1, fail20
  darken nearby area and inside of a room.
  
• Detect Near
  level2, cost2, fail25
  detects monsters. detects traps, doors and stairs at level 5.detects objects at level 15. enlightenment at level 45.
  
• Hide in Leafs
  level3, cost3, fail25
  short teleport.
  
• Kawarimi
  level5, cost3, fail30
  teleport as you receive an attack. might be able to teleport just before receiving damages at higher level.
  
• Absconding
  level7, cost8, fail35
  teleport.
  
• Hit and Away
  level8, cost10, fail35
  attack and teleport in a time.
  
• Bind Monster
  level10, cost10, fail40
  attempt to freeze a monster.
  
• Ancient Knowledge
  level12, cost12, fail70
  identifies an item.
  
• Floating
  level15, cost10, fail50
  gives levitation for 20+d20 turns.
  
• Hide in Flame
  level17, cost12, fail45
  generate a fire ball (radius lvl/10+2, damage 50+lvl) centered on you, teleport(distance 30), and gives resistance to fire for lvl turns.
  
• Nyusin
  level18, cost20, fail40
  steps close to a monster and attacks at a time. The max distance is 5
  
• Syuriken Spreading
  level20, cost5, fail50
  shoots 8 iron Spikes in 8 random directions.
  
• Chain Hook
  level22, cost15, fail55
  teleports a monster to a place adjacent to you
  
• Smoke Ball
  level25, cost32, fail60
  fires a confusion ball. The radius is 3 and the damage is 0.
  
• Swap Position
  level28, cost32, fail60
  swaps positions of you and a monster.
  
• Glyph of Explosion
  level30, cost30, fail70
  sets a glyph under you. The glyph will explode when a monster moves on it.
  
• Hide in Mud
  level32, cost40, fail40
  makes you ethereal form which gives ability to pass walls(lvl/2+d(lvl/2) turns). and gives resistance to acid for lvl turns.
  
• Hide in Mist
  level34, cost35, fail50
  generate a poison ball (radius lvl/5+2, damage 75+lvl*2/3) centered on you, generate a drain life ball (radius lvl/5+2, damage 75+lvl*2/3) centered on you, generate a confusion ball (radius lvl/5+2, damage 75+lvl*2/3) centered on you, and teleport(distance 30).
  
• Rengoku-Kaen
  level38, cost40, fail60
  fires 3d9 beams in random directions. each is fire(possibility 1/2), nether(possibility 1/3) or plasma(1/6).Each damage is (6+lvl/8)d10.
  
• Bunshin
  level41, cost50, fail55
  completely protects you from any attacks at one in two chance. (6+d6 turns)