There are many paths to lichdom, some MORE SUBTLE than others. Some think they need but learn one ultimate spell. FOOLS! The keen minded know there is great power in the alchemical arts. Let me tell you one such tale.
Bones! HAHA Are we not but sentient MEAT hung upon ROCK that is grown! Living ROCK grown by yet smaller meat, the motes of life, the cells. Bones? Vile! Hilarious!