Our next Optional Quest in Monster Hunter World Iceborne is the High-Rank quest, Infernal Monarchy. This sees us off to the Wildspire Wastes to hunt both a Lunastra and Teostra. This quest is unlocked once you've completed the Blazing Sun questline and the quest No Remorse, No Surrender.
Our next Optional Quest in Monster Hunter World Iceborne is the High-Rank Quest, Blue Prominence. We're off to the Elder's Recess to hunt a Lunastra. This quest is unlocked as part of the chain that started with The Blazing Sun, Pandora's Arena, and No Remorse, No Surrender. Complete No Remorse, No Surrender to unlock this quest, Blue Prominence.
Our next quest in Monster Hunter World Iceborne is the Special Assignment; No Remorse, No Surrender. This is the final quest in the chain that began with The Blazing Sun, and Pandora's Arena. This time we're off to the Elder's Recess to hunt both a Teostra and Lunastra together. This quest also rewards you with the powerful Temporal Mantle when completed.
Our next Special Assignment is the quest, Pandora's Arena. This quest unlocks a new Elder Dragon for us to face, Lunastra. It is part of a chain of quests that began with The Blazing Sun. Once you have completed that quest, head back to speak to the Huntsman in Astera. You'll be able to get this quest from the Blacksmith at Seliana after you finish with the Huntsman. Speak to him to learn about a cornered Teostra that seems to be acting strangely in the arena.