The final weapon is the Spear torpedo, there is quite an accurate demonstration of it in the video. It is a special weapon such as all the other weapons we showed this week.
It drains power from your capacitor and when your capacitor is dry, your ship is defenseless with regard to energy, you cannot use any special devices/weapons or raise shields. So this brings a balance to special weapons and a nice dose of tactics and strategy to overall combat. Surrounded by a huge group of enemies? Use your super bomb, but it will drain your capacitor and leave you defenseless for a short while whilst your capacitor recharges.
Thanks for watching!