The list of Tier 6 spells instantly left Gauss craving them.
Tier 6 Transmutation spell, [Bones of the Earth].
It alters the geological structure, causing a forest of bone-like stone spikes to erupt from the ground and attack enemies. If Gauss mastered this spell, he could instantly alter the battlefield's terrain while utilizing the erupting stone spikes to inflict massive area-of-effect damage on enemy units.
Tier 6 Evocation spell, [Blade Barrier].
