The most important thing for a Lich is their Life Casket, so every Lich will try every means to hide it.
Some choose to bury it deep underground, others build a perfect magic-defense chamber, and some, suspicious and paranoid, carry it on their person at all times.
Amberser chose all of the above.
He constructed a special chamber in his castle to place a Life Casket, dug a deep pit beneath the chamber to hide another, and always carried one on his person, stashing several more in every place he went.
Gareth sent one, Withered Rose sent one, students sent one, servants sent one... he employed an abundance over scarcity approach.
As for which one was real, heh, that would remain a secret for the time being. After all, not one Life Casket was completely useless.
After taking care of these tasks, Amberser went to the prison to haul out all the Paladins, chained them up tightly, sealed them with magic, packed them into coffins, and then transported them outside the castle.
