I would like for you to build a game that runs in the browser.

 it should be 3d, maybe use babylon.js.

 I want it to be an action rpg like diablo, but with blocking/parrying/rolling mechanics.

 It should have an experience/attribute/class progression system.

 The graphics should be 3d polygonal.

 The setting should be zelda-like, with an overworld and many different kinds of dungeons to explore.  There
 should be at least one central town with shops.

 There should be a loot system that spawns stat appropriate gear and quantities of gold when enemies die.

 There should class specific skills to enhance combat, weapons, etc.

 There should be an inventory system where the player can choose their armor and weapons.

 Controls should be diablo-like.

 Use Headless chrome to test your work and verify it works as expected.

 Make a plan, then iterate until it's ready to demo.