These last two episodes feel like the dev team came back to this game and their only idea was "What if we made it HARDER?" They don't have anything more to offer than is provided in the first three, unfortunately.

The weaponry and enemies feel even more uninspired at this point, without a ton of room for expression of either one. These episodes don't have any new weapons, items, or enemies and they suffer for it. Encounters feel like a bunch of enemies thrown into a room and weapons are mostly just used thoughtlessly until their ammo runs out and you switch to a different one.

Some of the levels gesture at environmental storytelling, with architecture that seems more evocative and interesting or specific areas with a theme. In Shadow of the Serpent Riders you are fighting your way into castles or dealing with fast-flowing rivers, but none of this rises beyond the most basic representation. In the end they are all just rooms full of tons of enemies, rather than doing something creative with the gameplay to match these environments.

I didn't have much fun with either of these two episodes and with nothing of significance added they only serve to make the base game go on for much longer than the mechanics can sustain. I don't think Heretic is really worth playing through and these two episodes definitely are not. Skip them!