I think the five virtues: "अहिंसा सत्यमस्तेयं शौचः संयममेव च" ie Non-violence, Truth, Non-stealing, Purity and contol of all senses are the essence of Dharma/Smiri shastras in any yuga. So far as I know, both Manusamhita and the Mahabharata accept this.
I think the following prescriptions of Bhagavan Manu taken from https://vedkabhed.wordpress.com/2015/05/01/manu-smriti-and-untouchables/, IF QUOTED AND TRANSLATED CORRECTLY, are no less fierce than the Kaliyuga itself. Either we have to accept them as interpolations or have to accept what Swami Vivekananda wrote in his early youth : "The Smritis and the Puranas are productions of men of limited intelligence and are full of fallacies, errors, the feelings of class and malice. Only parts of them breathing broadness of spirit and love are acceptable, the rest are to be rejected. The Upanishads and the Gita are the true scriptures."
Manu Smriti 5.140 Following the path of equity, Sudras must shave their heads once, each month, follow the rules of purification laid down in respect of the Vaishyas, and eat the leavings of Brahmana’s food.
Manu Smriti 10.129 No collection of wealth must be made by a Sudra, even though he be able (to do it); for a Sudra who has acquired wealth, gives pain to Brahmanas food.
Manu Smriti 10.96 A man of low caste who through covetousness lives by the occupations of a higher one, the king shall deprive of his property and banish.
Manu Smriti 8.270-1. A once-born man (a Sudra), who insults a twice-born man with gross invective, shall have his tongue cut out; for he is of low origin. If he mentions the names and castes (gati) of the (twice-born) with contumely, an iron nail, ten fingers long, shall be thrust red-hot into his mouth.
Manu Smriti 8.272 If a Sudra insolently gives any religious or moral advice to a Brahmana, the king, shall cause hot oil to be poured into his mouth and ears.
Manu Smriti 8.281-2 A low-caste man who tries to place himself on the same seat with a man of a high caste, shall be branded on his hip and be banished, or (the king) shall cause his buttock to be gashed.
Manu Smriti 3.112 Even a Vaisya and a Sudra who have approached his [Brahmin] house in the manner of guests, he [Brahmin] may allow to eat with his servants, showing (thereby) his compassionate disposition.
Manu Smriti 3.92 Let him gently place on the ground (some food) for dogs, outcasts, Kandalas [Chandal] (Svapak), those afflicted with diseases that are punishments of former sins, crows, and insects.
Manu Smriti 5.131 Manu has declared that the flesh (of an animal) killed by dogs is pure, likewise (that) of a (beast) slain by carnivorous (animals) or by men of low caste (Dasyu), such as Kandalas.
Manu Smriti 8.279-80 With whatever limb a man of a low caste does hurt to (a man of the three) highest (castes), even that limb shall be cut off; that is the teaching of Manu. He who raises his hand or a stick, shall have his hand cut off; he who in anger kicks with his foot, shall have his foot cut off.
Manu Smriti 4.80 Let him [i.e., Brahmin] not give to a Sudra advice, nor the remnants (of his meal), nor food offered to the gods; nor let him explain the sacred law (to such a man), nor impose (upon him) a penance.
Manu Smriti 4.140 Let him [i.e., Dvija] not journey too early in the morning, nor too late in the evening, nor just during the midday (heat), nor with an unknown (companion), nor alone, nor with Sudra.
Manu Smriti 5.104 Let him not allow a dead Brahmana to be carried out by a Sudra, while men of the same caste are at hand; for that burnt-offering which is defiled by a Sudra’s touch is detrimental to (the deceased’s passage to) heaven.
I think time has come for us to understand what are our true Dharma that we can follow.