The High Druid's blade / Terry Brooks.

Colour maps on endpapers.

"Legend has it that Paxon Leah is descended from the royals and warriors who once waged war with magical weapons. But those heroes are long gone now, and there is nothing enchanted about the antique sword that hangs above Paxon's fireplace. He leads a quiet life -- until extraordinary circumstances overturn his simple world . . . and rewrite his destiny. When his sister is abducted by a mysterious stranger, Paxon races to her rescue with the only weapon he can find. He is stunned to discover powerful magic unleashed within him -- and within his ancestors' ancient blade. But his formidable new ability is dangerous in untrained hands and Paxon must master it quickly. Leaving behind home and hearth, he journeys to the keep of the Druid order to learn the secrets of magic and earn the right to become their sworn protector." -- Jacket.

"Paxon Leah never thought of the old family sword hanging above his living room hearth as anything other than an intriguing ornament...until his sister is kidnapped by a sorcerer. Following the dark mage with nothing but this piece of steel to protect him, Paxon stumbles into a plot to overthrow the Druids and remake the world...and accidentally unlocks the powers of the ancient blade. Now, he must learn to master the sword's power in order to protect not only his sister, but also the very people who are teaching him to control his powers in the first place: the Druids!"--