Starcraft2 Protoss Units

It seems as soon as one area of the alien threat is removed, another appears. The dragoon is finally a thing of the past, in it's place it seems the protoss have created a tougher fast attack machine. The immortals shields are geared for heavy weapons, the key to penetrating them is to attack with small munitions. Rumour has it that these protoss are on the decline we should strike them hard and eliminate them forever.