One day, I sat thinking, "Instead of cheap and cheesy 'qol' mods, what if there was just a certain requirement you had to fulfill to guarantee a certain item to drop?"

So here I am. Well not really, I don't know the second thing about modding, other than Visual Studio. So instead I reach my gracious grasp out to you fellows in the modding community to bring my fantabulous idea to reality. (thank me later)

What actually brought me this idea was Sorbet Cafe's video titled "16 Summoners vs Master mode". For no particular reason, during the EoL fight, I thought to myself "while the soaring insignia is a really good item, especially in vanilla, it's quite too easy to obtain."

And that brought me here, where I thought "If you don't touch the ground during EoL fight, you get guaranteed Insignia." And boy did I think that was stupid. 'Cause I know a lot of you folks 'don't have the time to grind for a single item' (complete bs). So instead, I thought, "Well just lower the normal drop rate way down!"

So I was thinking again, like the mastermind that I am, "Why only EoL?" So now I'm thinking again, to have every boss have a certain requirement for guaranteed drops. EX; King Slime will guarantee a Slimy Saddle drop if: No double jumps are used, otherwise lower the drop rate of S.Saddle slightly, because it's not a particularly low drop chance anyway.

So I'm sitting here thinking again, as I write this, a list of all bosses fight requirements for certain drops.

King Slime; Slimy Saddle guaranteed IF: no double jumps used. Alternatively, Full Ninja Gear IF: Every slime released is killed within 10 seconds. Royal Gel drop lowered by 50%.

EoC; Changed SoC drop conditions to; No grappling. Otherwise, lower drop rate by 50%.

EoW: Changed Worm Scarf drop conditions to; fight taken below surface/ do not get hit by more than 5 vile spit. Otherwise, lower drop rate by 50%.

BoC: BoConfusion conditions to; Kill every creeper within 15 seconds of the fight starting and do not get hit by a creeper more than 3 times. Otherwise, lower drop rate by 50%

Queen Bee: Honeyed Goggles conditions to; Do not use any mounts/do not drop below 20% hp. Otherwise, drop rate remains the same.

Deerclops: Radio Thing conditions to; fight during midnight blizzard (alt spawn conditions)
otherwise, drop rate remains the same

Skeletron: Chippy's Couch conditions to; Character name is Chippy or James, otherwise drop rate remains the same.

WoF: Breaker Blade, Clockwork AR, Laser Rifle and Firecracker conditions to: Kill Wall of Flesh with any of the weapon's respective class. Otherwise, drop rate remains the same.

Queen Slime: Blade Staff and G. Pillion conditions to; Summoner kill, no mounts. Alternatively Full Crystal Set to; No mount and do not fall below 20% HP.

Twins/Destroyer/S.Prime: Increased Hallowed Bar minimum quantity to 22 IF; the fight does not last longer than 3 minutes 30 seconds.

Plantera: Spore Sac conditions to; do not get hit by spores more than 10 times.

Golem: Picksaw guaranteed, no conditions. Stynger, Hatchet, Heat ray, SoE, Golem Fist conditions to: kill golem with any of the weapon's respective class, 50% chance for either Heat Ray/SoE if mage.

Duke Fishron: Fishron Wings conditions to; no teleporting/grappling. Bubble Gun. Flairon. R.Typhoon, Tempest Staff. Tsunami conditions to; kill duke with any of the weapons respective class, 50% chance for either Bubble Gun/R.Typhoon if mage.

EoL: S.Insignia conditions to: do not touch the ground during the fight. Nightglow, Starlight, Kaleidoscope, Eventide conditions to; kill eol with any of the weapon's respective class.

Lunatic Cultist: no change.

Moon Lord: Portal Gun conditions to; no teleporting/recalling. Weapon drop conditions to; kill ml with any of the weapons respective class. 33% for any melee, 50% for any ranged, 50% for any magic, 50% for any summoner.\

And that's it. The kinda crazy little list of proprietary prerequisites for whatever dinky drop you want.
Might do a Calamity list soon.