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Steel Horns: Certain barbarian tribes of the forests, specifically those who revere the unicorn, equip their mounts with a steel cap that fits snugly over the snout. This steep cap is topped by a twisted horn as long and as sharp as a spear. If the rider of a mount so equipped allows his mount to attack when it charges, it deals damage as a lance, meaning damage is doubled as a result of the charge. A mount using a steel horn on a charge attacks at its full normal attack bonus, plus the +2 bonus for the charge.
Certain cultures prefer to outfit their mounts with other, more elaborate horns, equipping their mounts with steel boar’s tusks, for example, or sweeping racks of elk ‘antlers’. These more fanciful steel horns still function as described above.