Helvius, The Dreadlord is the first post-ender dragon boss of survival expansion. Progression Map Page: Post-Dragon
Helvius can be summoned at a summoning station using Neptunium Essence as the ignition.
Helvius has a total of 1000 health and 9 attacks. His base attack damage is 20 hp (10 hearts), moves at a speed of about 17.2 meters per second, and has a follow range radius of 10,000. Upon summoning Helvius, the time will be locked to midnight for as long as the fight lasts.
Summon Attack: Occurs every 50 seconds and it summons about 5 Dread Guardians, vexes, and phantoms.
Dreadsmite: Occurs every 25 seconds and strikes you with lightning 19 times in the span of 1.8 seconds.
Dragon's Revenge: summons a rainfall of dragon fireballs every 37.5 seconds.
Ascalaphus Rebirth: Every minute and 40 seconds, a Son of Ascalaphus will spawn with the same stats as regular Ascalaphus just without the attacks.
Dreadwrath: Occurs every minute and 15 seconds as long as Helvius remains between 250 and 1000 health. Once Helvius falls below 250 health, the dreadwrath will be buffed to deal more damage and the intervals will be decreased to 25 seconds. This attack lasts for 10 seconds and Helvius will be invincible while the attack is active.
Below 333 Health: Rains powerful fireballs above the player every 25 seconds and he will start dashing. Below 666 health: Minions will be buffed to have an infinite follow range and Helvius will become faster.
Below Half Health: Raises into the air and becomes invincible until you kill the Elemental Titan that spawns. After that, the fight will continue as normal.
Below 100 Health: Summons a buffed version of Ascalaphus and raise into the air again, becoming invincible until you kill Ascalaphus and he will become even faster once you do.
Upon killing Helvius, you will receive an xp orb worth 31,000 points (from level 0-100 instantly) and an item called Titan's Flame. If you are in Grandmaster Mode/Legendary Mode, you will receive an early Dread Blade.