The second category includes the headhunting-related festivals to honour the most powerful deity of war, Sengalang Burong that comprises Gawai Burong (Bird Festival) and Gawai Amat/Asal (Real/Original Festival) with their successive ascending stages with the most famous one being Gawai Kenyalang (Hornbill Festival). This is perhaps the most elaborate and complex festival which can last into seven successive days of ritual incantation by lemambang bards. It is held normally after instructed by spirits in dreams. It is performed by tuai kayau (raid leader) called bujang berani (leading warriors) and war leader (tuai serang) who are known as "raja berani" (bravery king). In the past, this festival is vital to seek divine intervention to defeat enemies such as Baketan, Ukit, and Kayan during migrations into new territories.