The Spell Booster Charm for Dark Alchemy increases the duration of the spell. By default, the spell lasts 20 seconds. Each level of this charm increases the duration by 1 second. The charm increases the spell duration to 30 seconds at its maximum level.
Apparently these Spell Booster Charms are not of much use, unless one knows how to cast spells. Not many of my regulars do.
Time will tell
Dark Alchemy Duration (in seconds) = 20 + level
Level Cost = level ^ 3
Artefact Levels Edit
|Artefact Level||Dark Alchemy
Duration (in seconds)
|Cost (in Crystals)||Cumulative Cost|