The Clan leader calls a Clan meeting to appoint a new apprentice and assign a mentor to them. The following words are used, by tradition:
Leader: (Kit), you have reached the age of six moons, and it is time for you to be apprenticed. From this day on, until you receive your warrior name, you will be known as (new name, ending with "paw"). Your mentor will be (name of warrior or medicine cat). I hope (name of warrior or medicine cat) will pass down all he/she knows on to you.
The leader calls up the warrior he/she has chosen as a mentor.
Leader: (Warrior), you are ready to take on an apprentice. You have received excellent training from (former mentor), and you have shown yourself to be (quality) and (quality). You will be the mentor of (apprentice), and I expect you to pass on all you know to (apprentice).
The mentor touches noses with the apprentice, and the Clan greets the new apprentice by calling out their name. After this, the apprentice will usually go greet their family, or go see their mentor.
MEDICINE CAT'S APPRENTICE CEREMONY
The leader calls a Clan meeting, after the Clan's medicine cat announces that they wish to mentor an apprentice. After their ceremony, the mentor touches noses with the apprentice, and the Clan greets the new apprentice.
At the next half moon, the medicine cat goes with the apprentice to the Clans' sacred place to present them to the warrior ancestors, where the apprentice confirms their wish to be a medicine cat. The following words are used, by tradition;
Medicine cat: (Apprentice), is it your wish to enter the mysteries of StarClan as a medicine cat? Apprentice: It is. Medicine cat: Then come forward.
The apprentice steps forward
Medicine cat: Warriors of StarClan, I present you with this apprentice. They have chosen the path of a medicine cat. Grant them your wisdom and insight so that they may understand your ways and heal their Clan in accordance with your will.
The medicine cat apprentice touches his/her nose to the Starpool or drinks from the Starpool. Then the medicine cat and the apprentice lay down and have a dream from StarClan.
An apprenticeship usually lasts six moons or more. Once a mentor is satisfied with their apprentice's progress and skills, they recommend them to the leader of the Clan. Then, the apprentice must pass an assessment, in which their abilities as a warrior are checked. In cases when the apprentice has just made an important contribution to the Clan, the leader may decide that there is no need for an assessment.
If the Clan Leader is satisfied, they call a Clan meeting and call the apprentice forward. The following words are used, by tradition:
Leader: I, (Leader), leader of (Clan), call upon my warrior ancestors to look down on this apprentice. (He/she) has trained hard to understand the ways of your noble code, and I commend (him/her) to you as a warrior in (his/her) turn. Leader: (Apprentice), do you promise to uphold the warrior code and to protect and defend your Clan, even at the cost of your life? Apprentice: I do. Leader: Then by the powers of StarClan, I give you your warrior name. (Apprentice), from this moment on you will be known as (new warrior name). StarClan honors your (virtues), and we welcome you as a full warrior of (Clan).
The leader rests their muzzle on the apprentice's head, and the former apprentice licks the leader's shoulder. The rest of the Clan then greets the new warrior by calling them by their new name. The warrior will sit a silent vigil guarding the camp that night, unless that is not possible (such as Squirrelflight's ceremony, when the Clan did not have a camp, and the task of exploring the lake was assigned) or if the cat is injured.
Virtues During the apprentice's warrior ceremony, two major virtues of the apprentice are listed; the first is usually (but not always) courage. A list of virtues, but not limited too, are located here warrior cat wiki.
MEDICINE CAT CEREMONY
Apprenticeship for medicine cats usually lasts much longer than those for warriors. The cat must learn about all available herbs and remedies, and the treatment of diseases and injuries.
Once the Clan's medicine cat is satisfied with the apprentice's knowledge, they go to the Starpool. This is the only ceremony that is not performed by the Leader. The following words are used, by tradition:
Medicine Cat: I, (name), medicine cat of ___Clan, call upon my warrior ancestors to look down on this apprentice. (He/she) has trained hard to understand the ways of a medicine cat, and with your help (he/she) will serve (his/her) Clan for many moons. Medicine Cat: ___paw, do you promise to uphold the ways of a medicine cat, to stand apart from rivalry between Clan and Clan and to protect all cats equally, even at the cost of your life? Apprentice: I do. Medicine Cat: Then by the powers of StarClan I give you your true name as a medicine cat. ___paw, from this moment you will be known as (new name). StarClan honors your (virtues), and we welcome you as a full medicine cat of (Clan).
The medicine cat rests their muzzle on the apprentice's head, and they lick the mentor's shoulder. The other medicine cats greet them by their new name.
Leader: I say these words before StarClan, so that the spirits of our warrior ancestors (or former deputy name) may hear and approve of my choice. The new deputy of (Clan) is (warrior's name).
NAME CHANGING CEREMONY
The leader calls a Clan meeting, and performs the change with the following words:
Leader: "Spirits of StarClan, you know every cat by name. I ask you now to take away the name from the cat you see before you, for it no longer stands for what he/she is. By my authority as Clan leader, and with the approval of our warrior ancestors, I give this cat a new name. From this moment on he/she will be known as (new name), for (description of the reason)."
An aging warrior, queen, or medicine cat may retire as an elder due to own initiative, when they feel they cannot help the Clan efficiently any more. A cat may also retire if they are hindered from serving their Clan through old age, illness, or injury .They report this to the Clan Leader, who calls a Clan meeting and addresses the warrior.
Leader: (Warrior), is it your wish to give up the name of a warrior and go to join the elders? Warrior: It is. Leader: Your Clan honors you and all the service you have given to us. I call upon StarClan to give you many moons of rest. The Clan will call out the retired warrior's name and then they will go to the elder's den. An elder may receive a completely different name, with a different ceremony.
Usually, an elder ceremony is held only when a cat retires due to old age. If they are forced to retire because of a severe injury, there is no ceremony.
if you like to read up on what occurs during the leader's ceremony, check out the warrior cats wiki for more details!