Answering step by step in simple language:

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1. What happens to a soul in moksh?

According to Jainism:

• When a soul (jiv) attains moksh, all its karmas (good + bad) are completely destroyed.
• The soul becomes a Siddha – a fully pure soul.
• It rises to Siddha-shila, the topmost region of the universe, and stays there forever. ( jainknowledge.com)

In moksh the soul has:

• Infinite knowledge (anant jnān)
• Infinite perception (anant darshan)
• Infinite bliss (anant sukh)
• Infinite energy (anant vīrya) ( jainknowledge.com)

There is:

• No body, no senses, no birth, no death, no movement, no new karma.
• The soul remains eternally in its own pure nature.

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2. “All sorrow ends – does happiness also end?”

This is a very important and subtle point.

In Jainism:

• Worldly happiness (laukik sukh) is always mixed – a little pleasure, a little fear, change, and dependency (on body, people, objects, situations).
• Moksh-bliss (anant sukh) is not that type of happiness.

When we say in Jainism that in moksh:

• “All sorrow/dukh ends” – it means:

- No physical pain, no mental tension, no fear, no separation, no disappointment, no birth–death, no loss.

At the same time we also say:

• The Siddha experiences eternal, unobstructed bliss (abādhya sukh) forever.( jainknowledge.com)

So:

• Sorrow ends completely.
• Limited, changing, sense-based happiness also ends.
• But this is replaced by infinite, steady, pure bliss that never decreases and never ends.

So the soul does not become “blank” or “neutral”. Instead, it remains in permanent highest bliss.

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3. How does a soul “feel” in moksh? What experience is there?

Language is limited, but Jain scriptures describe it like this:

1. No body, no senses

- In moksh there is no body, so there is no seeing through eyes, hearing through ears, etc. - Yet the soul knows and perceives everything directly through its own nature (keval-jnān, keval-darshan).( jainknowledge.com)

1. Infinite knowledge & perception

- The Siddha knows: - All substances (dravya) - All times (past, present, future) - All modes (paryāy) - There is no ignorance, no doubt, no confusion.

1. Infinite, unbroken bliss

- No disturbance, no restlessness. - No desire: “I want this; I don’t want that.” - Just pure, natural ānand (bliss) of the soul’s own purity.

1. Complete detachment (vitragata)

- No attachment, no hatred. - No “I like this person, I hate that person”. - Pure equanimity (samyaktā) toward all.

1. Eternal stability

- The Siddha never moves from Siddha-shila, never falls, never returns to birth. - This state is akshay sthiti – unending, unbreakable condition.( jainknowledge.com)

So, “what does he feel?” – in short:

> An individual, distinct soul, without body, > staying forever at Siddha-shila, > with infinite knowledge, infinite perception, > and constant infinite bliss, > completely free from every type of sorrow, fear, and desire.

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Digambar & Shvetambar view

On moksh itself and the state of Siddha, both traditions agree:

• Moksh = complete destruction of all karmas.
• The liberated soul goes to Siddha-shila.
• It has infinite knowledge, perception, bliss, and energy.
• No body, no senses, no rebirth.

Differences between Digambar–Shvetambar are more about:

• Details of the path (monastic rules, some doctrinal nuances, issues like whether women can attain final moksh in that life, etc.) – not about the basic experience of the Siddha.

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If you want to read a simple article in very easy language on what happens to the soul in moksh, you can refer to this JainKnowledge page: You can read more here