The Warlord's Blade (Calebra Fantasy Book 1)

Lord Darios is a sorcerer, banished by the Wizards’ Council, who seeks revenge: the conquering of all Calebra.
Darios’ earth-power is awesome, but with the Ice-Fire of Calebra, a huge landia crystal capable of amplifying his powers, he and his demon armies could prove invincible.
Calebra’s only hope is Palendar’s warlord, Valias – a deadly Warrior of Darkness and a brilliant general. But can his warriors hold off the demon horde of the sorcerer long enough?
Armed with a power-sword created for him by the wizard, Taronlas, a master’s blade, but with a hilt made of landia crystal, he must pit his skills against the greatest master of wizardry and sorcery his people have ever seen.