Bountibox

Meet your Synergy Goblin: Bountibox - Bastok Mines K-9.

He provides spells unobtainable through scrolls:
 * Protectra V
 * Shellra V
 * Kayton
 * Hyoton
 * Huton
 * Doton
 * Haiton
 * Suiton
 * Dia III
 * Bio III
 * Blind II
 * Slow II
 * Paralyze II
 * Phalanx II
 * Flare II
 * Freeze II
 * Tornado II
 * Quake II
 * Burst II
 * Flood II

He also will combine elemental items into their catch-all equivalent:
 * Iridal Staff
 * Chatoyant Staff
 * Fotia Gorget
 * Hachirin-no-Obi

Trade him High Kindred Crests/Seals for an additional source of Ancient Beastcoins:
 * 1 High Kindred Seal = 3 Ancient Beastcoins
 * 1 High Kindred Crest = 5 Ancient Beastcoins