Life essence is very rare since there is no more production of it. One can only get it through personal contacts. Tandrake got his from his son. He bought it from Ghoto, who needed the money to buy a secure future for his wife and children in the immortal lands without him.
That is one of the major differences between the father and son. Tandrake never cared for Ghoto and would not have made such a stupid decision, but Ghoto always went the extra length to protect his family.
Now Tandrake has gained something truly invaluable from what he considers the most stupid decision that Ghoto could make. He had to sell all he had, but it was worth it. If anything, Tandrake finally felt that the birth of Ghoto might not be a bad thing after all.
The thought of that brought a smile to Tandrake's lips. He chuckled and said, "I have to become an immortal. If only because of my son. I will help out his family in his absence."