Sol's RNG new update added a PvP option alongside new auras, new merchants, various achievements and more. There's not much you can do with it right now, but you can still battle against your friends and other players who are open to PvP.
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Anyone can enable PvP in the options, which allows you to deal damage to other players, and for them to deal damage to you. All you need to do is open the settings by clicking on the gear icon on the left side of the screen, and then click on the empty square next to the PvP option with the two crossed swords icon.
You'll notice that simply enabling PvP won't change anything; you'll also need an Aura that can deal damage. Currently, there are only four Auras that can be used in PvP in Roblox's Soul's RNG: Zeus, Chromatic Genesis, Impeached, and Archangel.
Zeus is a 1 in 4,500,000 Aura that can deal 15 damage if the other player is hit by the lightning bolt. Chromatic Genesis is a mutation of the Chromatic Aura and is much harder to get with a 1 in 99,999,999 chance and deals 32 damage with a cinematic blast. Impeached is a bit harder to roll, with a massive 1 in 200,000,000 chance. It deals 30 damage with the Sword of Treachery. Finally, Archangel has a 1 in 250,000,000 chance to roll, but it deals the most damage. It creates three progressively larger explosions that deal 12 damage, totaling 36 damage to health.