Paladin wants to become an undead slayer via cdq
Undead slayer has only 10 mechanicle levels. Then stops completely.
Is the paladin stuck at what ever level he is at that point, example if the paladin becomes an undead slayer at level 10, he is stuck at level 20 without the possibility to further mechanical growth, if there's no way a paladin can come back to Paladinhood even through cdq.
OR
The paladin can take an other cdq to further his growth as a paladin.
Asking because for example,
the order of the shining hand is mostly paladins, which means many of them would obviously become undead slayer due to the history of those paladins having trained to specifically fight undeads through divine powers.
Order of the Shining Hand
Formerly called the Order of the Unliving Hunters, this small sect within the church was also a part of the judiciary before the schism. The order is made up of paladins; at last count 301 men and women. The tie that binds this group is devotion. While every order boasts piety, the Shining Hand uses their faith as their primary weapon when hunting and dispatching unliving. In addition, many of the duties of the justicers that the Order of the Longsword has not picked up, have fallen to the Shining Hand.
The Order of the Unliving Hunters began as a subset of paladins who specialized out of necessity during a war on a group of necromantic practitioners over 1,000 years ago on Alindor. Trained in the most effective ways to battle and destroy unliving, the group thrived and found use, and the order came soon after. The meeting hall at the fallen temple in Prantz was said to hold portraits of the Hand going back 600 years. The order is led by the Hand, which until Quantum Windword has also been a paladin. He or she answers only to the Auscultare and Heart of Toran, and has tremendous pull inside the church. Under the Hand are two armsmen, chosen by vote. The current Hand is Theodosia Varamost.
The restricted multiclassing page on LORE says nothing about that, nor does
the character submissioin and approvals policy thread.