@Videofreak In my limited tests I've been encountering 10-20 Hosts per run, so you'd need 50 luck (1/20 chance) to get the drop. So if you're lucky, you might get a run with Luck Up pills, Mom's Pill Box/Placebo, and plenty of batteries -- but that's a rare setup. In my own runs I'm only getting 0-4 luck (1/1000 to 1/200 chance). If you have your own data you'd like to share that'd be great, since this is only based on my own runs atm. I'm aiming for a balance between both casual players and min/maxers, and I'm somewhere in between. I have been looking into Mod Config Menu though, so if I add support for that then I can just add a multiplier for the luck bonus.

@Revalopod Ohhh, I get you! That might actually be possible -- before the drop, just check if the room's cleared -- I'll look into that

I would make the base chance lower, as luck multiplies it so much its basically impossible not to get a hat drop by the end of the run

Well for my idea I was thinking a simpler method to achieve it would be that there would only be a chance for a host hat to drop when the room is cleared, meaning you'd have to beat all the enemies first and then bomb the skulls. Anyway, good job on your first lua!

@Revalopod That's a good idea, but perhaps you could just give destroyed skulls a % chance to spawn Host Hat instead of a Host. That might feel more organic, and would alleviate the minor time sink of still having to kill Hosts. This is only my first Lua project though, so that's all a bit outside my experience atm (as is checking how an enemy was spawned, especially performantly). If I end up making Isaac mods and gain more experience, I'll keep the idea in mind for the future

I just think it's strange to have a normal enemy drop an item. Could there be an option to only have a chance from the skull-born hosts?

@Revalopod Any Host. Was the mention of skulls confusing? I've edited that bit slightly to be clearer.

So it's from any host, or just the hosts spawned from destroying skulls?