There are 2 books in the The Raistlin Chronicles series. The newest book is Brothers in Arms which came out in 1999.

1
The Soulforge

Book cover of The Soulforge
Discover the early history of Raistlin Majere, one of Dragonlance’s most complicated yet beloved characters, in this prequel to the wildly popular Chronicles and Legends series
 
A mage’s soul is forged in the crucible of magic.
 
Raistlin Majere is six years old when he meets an archmage who enrolls him…
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2
Brothers in Arms

By Margaret Weis , Don Perrin,

Book cover of Brothers in Arms
The Innocence of Youth Lost in War

In the fiery siege of the ciy of Hope's End the young mage Raistlin must leave behind his ideals to save himself and his brother. Yet as Raistlin and Caramon train as mercenaries, far away another soul is forged in the heat of…