Pc on a gold spiral rod req9

Gold spiral rod
req 9 (curses)
dmg 11-22
energy +5 while health is above 50%
halves casting time of death magic spells(chance 20%)
Thank you very much

any idea about its worth?
Someone offered me 50k but i don't know if i had to accept or not.Maybe i lost the big chance of my life or maybe not^^.
Help me pls