General of Watatsumi's army is a Geo character and before unleashing his might on the enemy you will first need to upgrade the character a little. Here is the complete list of the materials needed for the geo character.
Gorou Ascension Materials
Gorou Talents Upgrade Materials List
If you're looking to upgrade your Noelle here is the complete list of the materials you'll have to farm to Ascend the Geo character and her talents.