Answer:
Taimur's invasion of Delhi in 1398 CE dealt a final blow to an already weakened Delhi Sultanate. The Delhi Sultanate, which had been established in the 13th century, had already been weakened by internal conflicts, weak rulers, and increasing pressure from other regional powers.
Taimur's invasion added to these problems by destroying the city of Delhi, massacring its inhabitants, and looting its wealth. The invasion caused immense damage to the already weakened Delhi Sultanate, severely weakening its military, political, and economic power.
As a result, the Delhi Sultanate was unable to recover from the invasion of Taimur, and several regional powers emerged as dominant players in the region. The invasion thus marked the beginning of the end of the Delhi Sultanate and paved the way for the emergence of the Mughal Empire in India.