ZDC Updated RSs ラジアータ ストーリーズ D10-11 Part 028 Farus, Morfin 1 & Break Parry Attack Grind For Other Weapons + Spear Treeman Training Start

Since you can learn Eacy weapon's Volty via the Treemon Training you just need to unlock all 4 weapons Break Parry Attacks to finish the training and get each weapon type upgrade.