Great Oaf

 is an idol.

Obtaining

 * Crafted by an Artificer (Lv. 145) from
 * 2 Royal Pingwin Essence
 * 2 Forest Substrate
 * 2 Sparkling Pebble
 * 2000 Nugget
 * 1 Stretch Wing
 * 1 Mama Pingwin Down
 * 10 Warguerite Bark