Malaysia 10 cent year 2005 : Major Die Break Error

Malaysia 10 cent coin year 2005 with Major Die Break strike error
What is Die Break and how it happened?

Dies subject to excessive pressure or that are worn will sometimes develop cracks. Cracks appear as raised irregular lines that can distort legends and other parts of the coin's design.  When a piece falls out of the die, coins struck from the damaged die show a raised lump or cud where the design is missing. Value depends on the size and placement of the die break or cud. In this Malaysia 10 cent coin we can definitely see a raised 

lump which covered the design of the year (20) and the word Bank.