The first thing he did when he was back home was chat with his parents just a family talk no big deal. the next thing was he absorbed the souls in slytherins locket he gained no powers from it basically it was just a locket slytherin kept family photos of him and his wife in. he took those out and put it in his collection. now the cup on the other hand had a special ability but it wasn't one he could absorb the cups effect was it doubled the effect of potions and things drunk from it a nice thing when you have phoenix tears and elixir of life. That went straight into the Gate of Babylon he reread the Harry Potter books for a bit of minor information there were things he wanted and his eidetic memory was new so he still had things he had forgotten he would just need to concentrate a bit to bring it all back with some meditation and occulmency. The first thing he did was head to the orphanage that old voldie came from around that area was a beach and cliffs he wanted to get into the lockets hidden location there were a few things he wanted the first was The Drink of Despair in the basin it is a mysterious potion which induces fear, delirium, and extreme thirst. The drink cannot be penetrated by hand, vanished, parted, scooped up, siphoned away, Transfigured, Charmed, or made to change its nature in any way. It can only be drained away by drinking. In spite of all this, the potion can be magically refilled by a skilled spellcaster. This would provide a powerful defence, as one person cannot drink the entire content without collapsing from the terrible effects, and would require a second person to force feed the potion, which Voldemort considered impossible due to the enchanted boat is designed to carry only one adult Wizard (though Voldemort did not consider underage wizards or magical creatures such as house elves, presumably because he underestimated them). the second thing he wanted was the inferius at the bottom of the lake They are corpses, dead bodies that have been bewitched to do a Dark wizard's bidding. Inferi have not been seen for a long time, however, not since Voldemort was last powerful... He killed enough people to make an army of them, of course.During the First Wizarding War, Voldemort was known to have created an army of Inferi from the large number of people he murdered. He placed such an army within the lake of Salazar Slytherin's Locket's hiding place.
The Inferi in question were mostly vagrant, homeless Muggles murdered by Voldemort, but some of them were the earthly remains of wizards and witches who 'disappeared' during the war without explanation. This could possibly include wizards from the Ministry, members of the Order that were never found, or just random unlucky witches and wizards.
when Regulus Black attempted to destroy the said Horcrux, he succumbed to the Drink of Despair's effects and tried to take a drink of water from the lake, only to trigger the Inferi and was killed by them. Kreacher, his house elf, managed to make it out of the cave with the locket.Regulus' body most likely remains in the crystal cave as part of Voldemort's army. He figured he could let Sirius give his brother a proper funeral. he had found the entrance as him and cut open his palm splashing blood on the wall which slid open revealing the massive cavern with hidden lake he saw spent a good 15 minutes finding the chain for the boat to the center island he used his kingdom to suck out the drink of despair into a small jar he then put into his gate taking a long with him the fake locket for kreacher. the then opened a portal in the water and started to suck up bodies and the lake he would keep them stored for now he has no place to put them he ended up with a little over 5 thousand inferius and regulas blacks body he then teleported home via his kingdom after taking the enchanted boat. him Sirius Bella and kreacher had a small funeral for Regulus and buried him behind Sirius mansion in a nice grave of a hero. Sirius was proud of his brother. next he took the Knights bus to little hangleton the family home of the riddles he had to find the gaunt shack and it took him a few hours but he finally succeeded it was a run down place and he knew if he went in all he would meet is death that place had traps and curses and snakes all over he had only 2 options 1 blow the whole thing sky fucking high and search for the ring after. that however was out just in case voldie checked on the house it would be hard to miss a blown up building. next step wave tactics of Shadows this is what he'd be doing. he sat down and summoned shadow after shadow death after death after death he learned a lot from these deaths and it kept going 5 deaths 10,20 30 he had to start paying in experience at about 76 deaths he finally got the ring that place was a snake filled death trap the ring instantly went into his inventory it had both powerful compulsions and a withering curse on it This curse would rapidly cause the death of anyone who came into contact with it, although in certain cases the spread of the curse could be slowed down by magical means. In the case of Dumbledore, this curse caused serious injury to his hand, causing it to look as if it had died, and would prove fatal in roughly one year. It was also the type of curse that would strengthen over time. Regardless of the methods of delaying the spread, there is no known way of removing or completely stopping this curse, though Snape claimed that he may have been able to do more to stop the curse had Dumbledore come to him more quickly. Its unknown if Dumbledore would have escaped the curse, if he had simply removed his hand from his body.
Although removing the curse from an infected individual is seemingly impossible, it can be removed from the host object if said artefact is damaged to a certain degree. he went back home and took a good night's rest with the girls living through deaths one after another in his shadows is not good for the mind he needs cuddles to fix it he can deal with the ring tommorow.