I am lookinh for a novel which the mc has an illness that he needs to find cure and that he also uses demon techniques and also his story revolves around revenge he also found a sword(not sure) within a monster cave. The mc died upon revenge and travelled back in time. Also he also saved a bunch of people inside a jungle base. Thats all i can remember. Please help.
Sounds really like "Limitless Sword God". The MC in this Story has some strange and Rare illness, that make his unable to Cultivate, and only can live with the help of this Maid (Adopted Sister) that takes care of him. She lates dies and MC uses all he can use to cure his illness, get stronger and take revenge, Mostly from Demons (the Enemy of Humans). After Rebirth he collected herbs to cure his illness and found a Book/Sword and became the Successor of the Limitless Sword Sect. The Part with saves people in a Jungle did come up early in the Story too. He saved a Bunch of cultivators of a Sect from a Evil Sect and robbers.