Bhai Kulbir singh ji
Per Hindu Puranas, Kalki avtar will be the last avtar who will appear at the end of kaliyug. These avatars in Hinduism are incarnation of Vishnu and are considered supreme authority.
Guru Sahib has taken base story of chaubis avtars from Puranas but has altered their lives extensively by adding his own writings interspersed here and there. Thus he has adapted puranic text to sikh view considering akal purakh as supreme and these avtars His creation. Additionally he wrote long invocation in the beginning bringing these avtars to almost human level.
Guru sahib writes in invocation
ਜੋ ਚਉਬੀਸ ਅਵਤਾਰ ਕਹਾਏ ॥
जो चउबीस अवतार कहाए ॥
Those who are called twenty-four incarnations;
ਤਿਨ ਭੀ ਤੁਮ ਪ੍ਰਭ ਤਨਿਕ ਨ ਪਾਏ ॥
तिन भी तुम प्रभ तनिक न पाए ॥
O Lord ! they even could not realise thee in a small measure;
ਸਭ ਹੀ ਜਗ ਭਰਮੇ ਭਵ ਰਾਯੰ ॥
सभ ही जग भरमे भव रायं ॥
They became kings of the world and got deluded;
ਤਾ ਤੇ ਨਾਮ ਬਿਅੰਤ ਕਹਾਯੰ ॥੭॥
ता ते नाम बिअंत कहायं ॥७॥
Therefore they were called by innumerable names.7.
Chaubis avtar, Dasam Granth
Guru sahib writes about Vishnu
ਚੌਪਈ ॥
चौपई ॥
CHAUPAI
ਬ੍ਰਹਮਾਦਿਕ ਸਭ ਹੀ ਪਚਹਾਰੇ ॥
ब्रहमादिक सभ ही पचहारे ॥
Brahma and others have got tired in knowing Thy end;
ਬਿਸਨ ਮਹੇਸ੍ਵਰ ਕਉਨ ਬਿਚਾਰੇ ॥
बिसन महेस्वर कउन बिचारे ॥
Who are the helpless gods Vishnu and Shiva?
ਚੰਦ ਸੂਰ ਜਿਨਿ ਕਰੇ ਬਿਚਾਰਾ ॥
चंद सूर जिनि करे बिचारा ॥
The sun and moon also meditate on Thee;
ਤਾ ਤੇ ਜਨੀਯਤ ਹੈ ਕਰਤਾਰਾ ॥੧੪॥
ता ते जनीयत है करतारा ॥१४॥
Therefore Thou art known as the Creator.14.
Chaubis avtar, Dasam Granth
Now coming to Kalki avtar as described in Dasam Granth sahib, it is observed from the text kalki avtar of Dasam Granth is different than that of Puranas. Guru ji writes that there was gross injustice and chaos in society. Then kalki avtar appears restores order. When he conquers all, he gets pride and asks people to adore him as God
ਜਗ ਜੀਤਿਓ ਜਬ ਸਰਬ ॥ ਤਬ ਬਾਢਿਓ ਅਤਿ ਗਰਬ ॥ ਦਿਯ ਕਾਲ ਪੁਰਖ ਬਿਸਾਰ ॥ ਇਹ ਭਾਂਤ ਕੀਨ ਬਿਚਾਰ ॥੫੮੩॥
जग जीतिओ जब सरब ॥ तब बाढिओ अति गरब ॥ दिय काल पुरख बिसार ॥ इह भांत कीन बिचार ॥५८३॥
When he conquered the whole world, his pride was extremely increased; he also forgot the unmanifested Brahmin and said this;583.
ਬਿਨ ਮੋਹਿ ਦੂਸ੍ਰ ਨ ਔਰ ॥ ਅਸ ਮਾਨਿਯੋ ਸਭ ਠਉਰ ॥ ਜਗੁ ਜੀਤ ਕੀਨ ਗੁਲਾਮ ॥ ਆਪਨ ਜਪਾਯੋ ਨਾਮ ॥੫੮੪॥
बिन मोहि दूस्र न और ॥ अस मानियो सभ ठउर ॥ जगु जीत कीन गुलाम ॥ आपन जपायो नाम ॥५८४॥
There is no second except me and the same is accepted at all the place; I have conquered the whole world and made it my slave and have caused everyone to repeat my name.584.ਜਗ ਐਸ ਰੀਤ ਚਲਾਇ ॥ ਸਿਰ ਅਤ੍ਰ ਪਤ੍ਰ ਫਿਰਾਇ ॥ ਸਭ ਲੋਗ ਆਪਨ ਮਾਨ ॥ ਤਰ ਆਂਖ ਅਉਰ ਨ ਆਨ ॥੫੮੫॥
जग ऐस रीत चलाइ ॥ सिर अत्र पत्र फिराइ ॥ सभ लोग आपन मान ॥ तर आंख अउर न आन ॥५८५॥
I have given life again to the traditional and have swung the canopy over my head; all the people consider me as their own and none other comes to their sight.585.
ਨਹਿ ਕਾਲ ਪੁਰਖ ਜਪੰਤ ॥ ਨਹਿ ਦੇਵ ਜਾਪ ਭਣੰਤ ॥
No one repeats the name of the Lord-God or the name of any other God goddess
Kalki avtar, Dasam Granth sahib
Seeing this behaviour of kalki avtar , Akal purakh sends another person named Mehndi meer to show kalki avtar his place.
ਤਬ ਕਾਲ ਦੇਵ ਰਿਸਾਇ ॥ ਇਕ ਅਉਰ ਪੁਰਖ ਬਨਾਇ ॥੫੮੬॥
seeing this the Unamanifested Brahma created another purusha.586.
ਰੱਚਿ ਅਸ ਮਹਿਦੀ ਮੀਰ ॥ ਰਿਸਵੰਤ ਹਾਠ ਹਮੀਰ ॥ ਤਿਹ ਤਉਨ ਕੋ ਬਧੁ ਕੀਨ ॥ ਪੁਨ ਆਪ ਮੋ ਕਿਯ ਲੀਨ ॥੫੮੭॥
्रचि अस महिदी मीर ॥ रिसवंत हाठ हमीर ॥ तिह तउन को बधु कीन ॥ पुन आप मो किय लीन ॥५८७॥
Mehdi Mir was created, who was very angry and persistent one; he killed the Kalki incarnation within himself again.587.
ਜਗ ਜੀਤ ਆਪਨ ਕੀਨ ॥ ਸਭ ਅੰਤ ਕਾਲ ਅਧੀਨ ॥ ਇਹ ਭਾਂਤ ਪੂਰ ਸੁਧਾਰ ॥ ਭਏ ਚੌਬਿਸੇ ਅਵਤਾਰ ॥੫੮੮॥
जग जीत आपन कीन ॥ सभ अंत काल अधीन ॥ इह भांत पूर सुधार ॥ भए चौबिसे अवतार ॥५८८॥
Those who conquered, the made it there possession they are all under the control of KAL (death) in the end; in this way,
with complete improvement the description of twenty-fourth incarnation is completed.588.
,
Kalki avtar, Dasam Granth sahib
Note: Please watch the last line where Guru sahib writes he has done improvement of descrition of twenty fourth incarnation.Mehndi meer also gets ego and declares himself God, Akal purakh devises way to kill him also.
ਤਬ ਜਾਨ ਕਾਲ ਪ੍ਰਬੀਨ ॥ ਤਿਹ ਮਾਰਿਓ ਕਰਿ ਦੀਨ ॥ ਇਕ ਕੀਟ ਦੀਨ ਉਪਾਇ ॥ ਤਿਸ ਕਾਨ ਪੈਠੋ ਜਾਇ ॥੧੦॥
तब जान काल प्रबीन ॥ तिह मारिओ करि दीन ॥ इक कीट दीन उपाइ ॥ तिस कान पैठो जाइ ॥१०॥
Reflecting over the egoistic state of Mir Mehdi the Unmanifested Brahman thought of killing him; he created an insect, which entered the ear of Mir Mehdi.10.
ਧਸਿ ਕੀਟ ਕਾਨਨ ਬੀਚ ॥ ਤਿਸ ਜੀਤਯੋ ਜਿਮ ਨੀਚ ॥ ਬਹੁ ਭਾਂਤ ਦੇ ਦੁਖ ਤਾਹਿ ॥ ਇਹ ਭਾਂਤਿ ਮਾਰਿਓ ਵਾਹਿ ॥੧੧॥
धसि कीट कानन बीच ॥ तिस जीतयो जिम नीच ॥ बहु भांत दे दुख ताहि ॥ इह भांति मारिओ वाहि ॥११॥
Entering his ear, that insect conquered that base fellow, and giving him various types of suffering, killed him in this way.11.
ਇਤਿ ਮਹਿਦੀ ਮੀਰ ਬਧਹ ॥
इति महिदी मीर बधह ॥
End of killing of Mehdi Mir.
Kalki Avtar, Dasam Granth sahib
So guru sahib says that akal purakh is supreme and these avtars elevated them as God and failed in their mission. Hence they met their end badly.
ਸਤਿਗੁਰਬਚਨਕਮਾਵਣੇਸਚਾਏਹੁਵੀਚਾਰੁ॥