To make it clear that it is with an RPG (role playing game) it needs an "an" in the title.

What I gathered:

- the paramaeters in lemma banish() are "given" - the statement right after lemma banish() is what we want to prove - all "wip" needs to replaced by something - blocks need to be finished with "qed;"

From there it's using the available tools.

Also, perfectly playable at mobile (at least a couple of first monsters).

Edit: after fighting enough other sphinxes, the first one loads, but the west-most fails with an explicit error message:

> This challenge failed to load. Retreating.

On the next floor, the sphinx over the exit stairs fails, preventing me from progressing.