Lesser obsidian potions.

Now that COTOs are a smaller value, it might be a good idea to make available 2 hour or 4 hour "lesser" versions of obsidian potions that can be bought on the crown store.

These potions would be just as effective, but not last as long. Thus, they would cost less.

Obviously, they could not stack with their respective obsidian potion, but would be used instead of them to get a shorter time period.