The fourth tray is for the smaller monsters from the Daimyo box

Five player pieces trays

The survivors of a long-ago invasion have taken refuge in the forgotten underground city of Gravehold

and training troops

Warhammer 40,000: Adeptus Mechanicus - Archaeopter Malingtype_Layer The fourth tray is forThe Archaeopter Fusilave is armed with no fewer than four cognis heavy stubbers as well as a bomb rack of tectomagnic munitions which it can drop on enemy ground forces from above. Archaeopter Fusilaves are great options for countering enemy assaults, blunting their advances with bombing runs that are equally destructive and disruptive. This kit can alternatively be used to build an Archaeopter Transvector or Archaeopter Stratoraptor instead, meaning