Right now the datapack adds procedural generated dungeons in the overworld, all in medieval style.
Every dungeon contains lootchests, spawners and a unique boss, which drops special weapons, tools or items, which aren't craftable in vanilla.
The weapons and items change attributes, spawn particle effects and give potioneffects. Every weapon has a secondary attack which is used by charging it up. Either by hitting enemies, earning xp or charging it up by sneaking. Some may cost xp to use.

Since update v1.2, it's possible to reinforce them and get their next level counterpart (diamond to netherite, iron to diamond or just increase durability), which mostly have stronger secondary attacks. But it's not possible to do it another way, than in the reinforcement books described way, which are sold by Rogue Merchants. It will not work.



Main Dungeons

v1.1 Mangrove Caves - Blighted Marrow {boss} - Flicia Shield of Levitation {bossdrop}
v1.2 Infested Church - Grimgar the Ferocious Bugbear {boss} - Evoker's Heavy Greatsword {bossdrop}
v1.3 Emberstone Bastion - Morbex the Necromancer {boss} - Morbex Heavy Warbow {bossdrop}


Mini Dungeons

v1.2 Witchhut I + II
v1.3 Witchhut Portalrrom

v1.2 Kaidaia the Alluring {miniboss} - Poisoned Sword {bossdrop}
v1.2 Malificaia the Devious {miniboss} - Undead's Bane Broadaxe {bossdrop}
v1.3 Salvynaia the Appalling {miniboss} - Luminous Fancy Flail {bossdrop}

v1.3 Mini-Dungeon I - special loot

Trader

Cloud Traders - procedural spawned airships, using loot-based currency, selling precious stuff
Rogue Merchants - selling miscellaneous unique items and books

Special Tools

Fortune's Pickaxe - additionally gives more xp when used and opens the chance of mining "gold- and silver coins" in the nether to trade before a bossfight
Smithing Hammer, Smithing Tong, Soulbound Shard - to reinforce special weapons, sold by both merchants

Story Books

v1.2 I - II
v1.3 III - V

Reinforcing:

Flicia Shield of Levitation: shield + netherite ingot + smithing hammer on an smithing table
Evoker's Heavy Greatsword: sword + netherite ingot + smithing hammer on a anvil
Morbex Heavy Warbow: bow + netherite ingot + soulbound shard on an fletching table
Poisoned Sword: sword + netherite ingot + smithing tong on a anvil
Undead's Bane Broadaxe: sword + netherite ingot + smithing tong on a anvil
Luminous Fancy Flail: sword + netherite ingot + smithing tong on a anvil
Fortune's Pickaxe: pickaxe + netherite ingot + smithing tong on a anvil
Emberstone Sabatons: boots + netherite ingot + smithing tong on an smithing table
Night's Edge: reinforced poisoned sword + reinforced undead's baned broadaxe + reinforced luminous fancy flail on the respwan anchor in the witchhut


Planned:

more dungeons across the dimesions
more bosses in the dungeons
more special weapons with custom functions
continue special crafting mechanics
continue the story

If you have suggestions to add or improve, or find bugs or unintensional behavior, please write them in the comments.

To install the datapack, just put the zip into the datapackfolder of your world. Then start the world and if needed run the /reload command to activate if not already. If it still doesn't work, extract the zip folder into the datapack folder and do the same.

    
I highly recommend optifine, to see more of the tooltips.
Possible without ressourcepack, but better with Conquest Ressourcepack by Monsterfish_