You can get this items from Event "Захват арены" (Arena Assault)
This event happens every day at 13:00 and 20:00 GMT + 3
To enter, walk up to the NPC "Начало ивента" (Start the event) at Starting Location in Archosaur.
Also you can get this item from boxes, named "Сундук формы оружия" (Weapon Shape Chest) which is in the Gold Shop or in the Personal Cabinet Shop
You cannot craft this item. It is only drops from pit bosses: Хранитель Asterinian 229 725 (respawn every 3 hours) and Творец Panteon 205 987 (respawn every 3 hours).
Also you can het it from chest, named . you can get from bosses, stated before and gshop.