Ending 3 is slightly tricky to find, but it's possible you've already found it. Just pushed an update that fixed Ending 3 not appearing in the ending list when reached.
Endings in the list are grouped by the room they're found in. That may help narrow things down.
The dwarf is also a favourite of mine! Don't worry, he's plenty happy and well cared for (even if he doesn't have much choice!).