Sefiroty form a group of ten artifacts which resemble stones or amulets. Each one of which stands for a different attribute. The singular form is sephirah.
|Alchemy contends there are ten elements of the Tree of Life - aspects of divinity we are capable of knowing. [...] the Sephirot are the Words of Creation carved as symbols into ten stones. The channels connecting them are the branches of the Tree of Life. There are ten Sephirot, divine Words of Creation: Keth'aar - Crown, Chocc'mah - Wisdom, Veen'ah - Understanding, Kezath - Love, Ghe'vrath - Power, Tipperath - Compassion, Neh'tza - Victory, 'Oth - Glory, Yesath - Foundation and Maal'kad - Kingdom.|
Tajemná věž and Obelisky, story quests in Kapitola II, demand the collection of all these artifacts. In order for the game to progress, they need to be placed inside certain ancient obelisky in the Bažiny.
The wikipedia article "Sephirot" offers further reading about this Kabbalistic idea.