Fargo's Mod/Soul of the Siblings

The Soul of the Siblings is a craftable post-Moon Lord accessory exclusive to. In depth, it provides;

30 Defense, +50% Damage, +10% Damage reduction, +100% Max Life, +50 Armor penetration, +20% movement speed, +200% flight time, Greatly increases life regen, +10 Max Minions, +10 Max Sentries, 50% Cheaper reforges

Grants Immunity to Slimed, Berserked, Lethargic, Infested, Flames of the Universe, Clipped Wings, Crippled, Frostburn, Mighty Wind, Squeaky Toy, Guilty, Webbed, Purified, Suffocation, Midas, Enemies Stealing Items, Shadowflame, Lovestruck, Stinky, Hexed, Cactus Damage, Ichor, Cursed Inferno, Defenseless, Lightning Rod, Nano Injection, Stunned, knockback, Rotting, Bloodthirsty, Biome Debuffs, Blackout, Obstructed, Dazed, Venom, Ivy Venom, Burning, Fused, Low Ground, Marked for Death, Swarming, Atrophied, Jammed, Reverse Mana Flow, Antisocial, Living Wasteland, Frozen, Hypothermia, Oozed, Withered Weapon, Withered Armor, Feral Bite, Mutant Nibble, Flipped, Unstable, Distorted, Curse of the Moon, Wet (negative effects), Electrified, Oceanic Maul, Moon Leech, Nullification Curse and Water Debuffs

Grants the ability to flip gravity, automatically consume mana potions when needed, teleport to last death point, fall much faster by holding down, protect certain modifiers from being accidentally reforged and fireball dash

Grants Autoswing, improved night vision and permanent Wet debuff (positive effects, only while riding cute fishron)

When you take damage you only take 1 damage (10% chance), erupt Shadowflame tentacles, gain Honey buff, summons spiky balls and summon homing Ancient Visions

You respawn twice as fast (only when not fighting a boss)

Attacks Inflict Clipped Wings (10% Chance, non-boss only), Venom, Ichor, Cursed Inferno, sometimes Lightning Rod, Rotting (Critical Strike only) and Inflict Betsy's Curse (Critical Strikes only)

Attacking summon homing frostfireballs at enemies, damaging hearts, mini homing eaters, pungent eyeball fires laser, fireballs (melee), lightning (ranged), ice boulder (magic), spawn bouncing pumpkins (ranged, Jack 'O 'Lantern Launcher) and bats (magic, bat scepter),

Killing enemies may drop potions

Summons a Baby rainbow slime minion, 2 Skeletron arms to whack enemies, 2 friendly probes that orbit around you (one probe fires automatically to enemies and the other fires lasers to your cursor), oscillating creepers (max 5) that absorb/block damage and spawn every 15 seconds, flying pungent eyeball, friendly cultist, mini Plantera, friendly super Flocko, Mini Saucer and True eyes of Cthulhu. The Creepers also have a Moon Lord-themed skin.

While running or dashing you create a trail of damaging blood scythes

While not moving, Creepers spawn faster

Landing a jump you summon a gel rain at your cursor, creates a fiery eruption (certain distance) and boulders

Armed and Magic skeletons from the dungeon are less hostile when not in dungeon

Press the 'Fireball' Hotkey to preform invincible fireball dash to cursor

History
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