In Jainism, Siddhashila is conceived as the realm at the very edge of the universe where liberated souls (siddhas) reside. The tradition does not describe a long, detailed physical journey to Siddhashila after Moksha; rather, it speaks of the soul shedding all karma and attaining kevala-jnana (pure, omniscient knowledge) and complete liberation. Once liberated, the soul remains in its pure, luminous, formless state and dwells in Siddhashila.

Key points to understand:

• Moksha ends all karmic bondage. A liberated soul has no further karmic particles to attract, so it remains in a state of pure awareness and bliss.
• Kevala-jnana is the pinnacle of knowledge; after attaining it, the soul is no longer tied to the cycles of birth and death.
• Siddhashila is described as the abode of perfected souls. For the liberated soul, there is no further ascent or descent; it resides there in a state beyond ordinary worldly locations.
• Different Jain sects may emphasize slightly different nuances, but the core idea remains: liberation ends the bondage of karma, and the soul dwells in Siddhashila in its pure state.

If you’d like, I can share the specific sutras or stotras that describe Siddhashila and the siddhas in more detail, along with their arth (meaning) as taught in Digambar and Shwetambar traditions.