Plague

Plague is the Second Herald of The Apocalypse, to be released in an upcoming update.

Although being referred to as the Apocalypse along with his brethren, he is considered to be a Mini-Boss, rather than a full one.

Boss Battle
Plague probably uses his exclusive weapon, (that no other boss can use), which is The Contagion Crossbow, (This idea may of been hinted from Minja536's idea of the Valkyrie, a similar bow-like weapon).

Trailer
This is info on what happened on the trailer.

It starts of with War's skull lying in the sand. The rest of his body's whereabouts are unknown.

It shows Plague standing on a pile of skulls, presumably one's of the people War killed.

Plague says War made for him a cradle of rot and decay, and that he made his skin out of crust human flesh, poured poison into his tangled veins, and filled his lungs with stench and bones of the dying.

Plague starts talking about his coming and how evil he is. After saying "Evil...is...Me.", he turns to you and crows swarm.

Trivia

 * This boss was predicted to be Famine, instead of Plague.
 * Ironically, he wears a Plague mask, a mask used by doctors during the wild west times, to use while helping people with diseases, (Plagues), such as Tuberculosis.
 * He wears totally black and his eyes flash green.
 * Plague's brother is War, which may hint that all the Horsemen of the Apocalypse are related.
 * Plague's clothing is the only clothing that has more protection than any other. Although, War's clothing have much more total protection.