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Keywords are:  'necromancer skills blood bottling bottle'

Skill: blood bottling           Lvl 30 Necr  (28%)
                                (important)   Requires: life tap and bottling
                                Group: Necromancer Blood Skills

Usage:
bottle tap blood          - lifetap and bottle some of your own blood
harvest blood <corpse>    - harvest and bottle blood from a corpse
cast bloodmist            - cast bloodmist using bottled blood

The 'blood bottling' skill allows necromancers to harvest and preserve
blood for later use.  Blood from other creatures is less powerful than
blood tapped directly from your own veins.

Blood tapped from yourself creates a bound potion you can use to restore
hp, mana, and movement later.  Blood harvested from corpses creates a
blood-group spell component which can be used in brews and for other
purposes.  Having bottled blood in your inventory when casting spells
like 'bloodmist' and 'bloodbond' eliminates the need to tap blood
from yourself.

Each bottle costs a small amount of gold to create, and you use mana
to alter the blood into a stable form for storage.

Bottling your blood when you have certain blood-infused spells active
can result in potions with differing properties.