Ah, yes, Dota 2. The game itself could be seen as a short scale PvP oriented ORPG. And there are custom maps, I think there are true ORPGs available.

This excellent and hardcore hack & slash has a lot of ORPG in it ; the fact that it is built like an MMO makes it even better for any ORPG fan.

Another hack & slash which could fulfill any ORPG hunger.

It may seem quite far from an ORPG but actually it has that kind of vague feeling that only ORPGs could provide. Any ORPG fan should try this great game

Stardew Valley has a lot of ORPG-y in it : small open world map, quests, hub town, pnj, item and level managment, locations with their definite uses...

With its pretty look and its hack & slash gameplay, it gives a soft ORPG feeling which could be enjoyed by some.

This sweet hack & slash is almost a ORPG. Huge open world to discover, tons of quests, bosses, secrets. Great game. Note: it has level-scaling.

This is a true ORPG in FPS point of view, where you can explore freely an open handcrafted map full of interesting spots, quests, enemies...