A Strange Blood Cave

We went to an island and discovered from people that a strange noise was coming from mine. The party decided to investigate the mine one day after. Strange things happen during the night, Luis attacked me and my pet mouse died. I know he didn't mean it because some strange black ooze was coming out of his eyes. We learn in the morning that Chrome also experienced it. Chrome wants to leave the place but in the end we decided to go to the mine and investigate what was happening. We had someone guide to the cave and lit the torches one by one until suddenly all the lights went out. Strange shadows and a woman appeared and started attacking us. Chrome and Luis got knocked out while fighting multiple times. I was trying my best to keep them alive and fighting the enemies. Fortunately, Tiffany was there to help attack the creatures. If not for Tiffany we would have lost the fight. After the woman was gone, some shadows disappeared making the fight more easier but it is still hard due to Chrome and Luis being unconscious and trying to keep them alive. I wish they would take care of themselves rather than me providing assistance. We somehow successfully killed or defeated the shadows. Luis and Chrome got severe injury. We decided to explore the cave because we didn't feel anymore danger. Upon exploring, we discovered items and a bloody demonic runes. Fortunately, we found some healing potion to aid Chrome and Luis injuries. I saw Chrome writing madly like she was possessed by something. After that we went back to the town and the guide that run away was asking help from the people. The guide was just a coward, leaving kids in a cave with strange creatures attacking them. The mayor met us and gave us reward. Some noble also eavesdrop and agreed to trade with us for the place we have. The reward, I got from the mayor was a white tailed orange fox, Chrome got her injuries healed up, Luis asked to trade with us, and the others I don't know. It seems we are also given rations. After that we set sail again to another island.
 
P.S. it seems that Luis is a noble with a family debt.