Hydra

In Greek mythology, the hydra was a serpent-
like monster with many heads. If you cut off
one hydra head, two more would grow back
in its place. All of the heads could spit deadly
acid. One of the heads is immortal and can
help the beast regenerate and stay young forever.
"Youth is an unrecoverable asset. Unless you
are a hydra, lucky you." - Anca Iovita