According to the Second Prophecy of Mandos, Morgoth will discover how to break the Door of Night, and will destroy the Sun and the Moon. For the love of these, Eärendil will return from the sky and shall meet Tulkas, Manwë (or Eönwë his herald) and Túrin Turambar on the plains of Valinor. Also in the Battle will be Ar-Pharazôn and the Númenóreans who broke the Ban and landed at Aman in S.A. 3319. These Númenóreans of the Great Armament were not destroyed, but are imprisoned in the Caves of the Forgotten, where they await the ending of the world. At the end, it will be by the hand of Túrin that finally death and destruction will be dealt to Melkor. Túrin will run his black sword Gurthang (Iron of Death) through Melkor's heart, thus avenging the Children of Húrin and all Men.
I think you can recognize Morgoth, Túrin and Eärendil here. There are two kings visible as well - to the far left, on a horse, is Finarfin leading the Noldor from Aman, and right from Túrin is Ar-Pharazôn. Painted with aniline watercolours.