Sith Alchemy, sometimes known as Force Alchemy is a science that refers to numerous areas under the Sith. It encompasses any power or technique which uses the Dark Side of the Force to permanently alter an item or living being.
Sith Alchemy could be used to:
Enhance the strength of weapons and armour, such as in the creation of Sith Warblades.
Genetically engineer or enhance alien species and creatures, such as in the creation of Sithspawn.
Create nefarious toxins and poisons, such as in the creation of Sith Poison.