Sewer Keeper

 is a boss type monster, with over 800 agility. Two can exist at any one time, in separate sewers. It may have a respawn time of under 30 minutes.

Spells

 * Inhaling:
 * Tearing:
 * Camouflage:
 * Summoning of Major Arachnee:
 * Rage:

Characteristics

 * 145 || 6000 || 8 || 6 || 90 || 37 || 35 || 20 || 10 || 112 || 72
 * 150 || 7000 || 8 || 6 || 92 || 39 || 37 || 22 || 12 || 119 || 79
 * 155 || 8000 || 8 || 6 || 94 || 41 || 39 || 24 || 14 || 126 || 86
 * 160 || 9000 || 8 || 6 || 96 || 43 || 41 || 26 || 16 || 133 || 93
 * 165 || 10000 || 8 || 6 || 98 || 45 || 43 || 28 || 18 || 140 || 100
 * }
 * 160 || 9000 || 8 || 6 || 96 || 43 || 41 || 26 || 16 || 133 || 93
 * 165 || 10000 || 8 || 6 || 98 || 45 || 43 || 28 || 18 || 140 || 100
 * }
 * 165 || 10000 || 8 || 6 || 98 || 45 || 43 || 28 || 18 || 140 || 100
 * }

Known Drops

 * Sewer warden boots || 20 ||
 * Dagger Skill || 1 ||
 * Arachnee Ambamulet || 80 ||
 * Small Scroll of Agility || ||
 * Small Scroll of Intelligence || || <700
 * Summon Arachnee Scroll || 5 ||
 * }
 * Small Scroll of Agility || ||
 * Small Scroll of Intelligence || || <700
 * Summon Arachnee Scroll || 5 ||
 * }
 * Summon Arachnee Scroll || 5 ||
 * }

Strategy
Level 165 one is very difficult to defeat. You will need a high level Eniripsa and make sure you have two Srams or Ecaflips as the Keeper goes invisible for 7 turns with a cooldown of 8 turns. That is, it's visible for 1 turn every 8 turns.

Alternatively, you may bring two Sacriers, a good Eniripsa, and a Sadida. You can then corner the Keeper with the Sacriers (think cooperation), heal with the Eniripsa, and place trees or other summons behind the Sacriers so that the Keeper doesn't spawn Major Arachnees. This works because the Keeper has a spawn range of 2, just like a level 1 Summoning of Chaferfu. The level 165 Keeper will usually hit for about 200-400 every other turn, but if cornered may skip hitting or summoning.

Shouldn't Location or Perception help..