Hearing what the old man said I started thinking are you sure this old man is not trying to collect revenge this way right. According to what I know if I eat a mana core above my level directly it will cause my body to explode or damage my body in a my way that I may not be able to walk or use mana again. Well my grandpa is here right if anything is about to happen he will save me. This was what I was think before I got interrupted by the old man voice.
"boy you really have trust issues. And please stop thinking bad about me I can hear you clearing. Where was your mind when I told you that I have merge with your consciousness." The old man said helplessly
Without saying anything but I thought about asking the old man "can you hear all of my though. I just try that to see if it was possible. Because if a am talking to myself. People will think I have gone crazy or something."
The old man replied "yes I can and please I am something let by your ancestor to protect and help you right. So they is no way I am going to try to harm you just because you insult me a little. But that will be a different case if you continue talking rudely to me"
Hearing this I suddenly felt chill go straight to my spine. Thinking about it what the old man said was reasonable. They is no way something left by ancestor to help me grow can arm me so I suddenly felt safe eating it. With that I threw the monster core inside my mouth and chew it. Immediately after I started chewing it, I felt a vicious energy flowing through my body. Suddenly I felt pain as if ants were biting my flesh from in the inside. It was extremely painful. I clinched my fist as I struggle not to lose consciousness. Due to the pain I was feeling.
I heard the old man voice "hold on boy, you need to remain focus and not loss consciousness. A wise man once said no pain, no gain. For you survival you have to hold on, for your revenge, you have to push through and for the protection of your domain and my family legacy, you can't give up."
Hearing what the old man words I said to myself "I have so many reasons I can't back down. They is no way this little thing can stop me."
And slowing I notice that the pain started reducing until it stopped completely. And I could feel a wage of mana inside my body that was not there before.
"That the work of the chaos devour. It will turn that vicious mana of the monster core into your own. You just need to circulate your cultivation technique for a while so that your body will accept the mana and you will turn it into your own completely"
I followed his instruction and stating circulating my cultivation technique until I could control every mana in my body.