Also what can you use your 0 level spells for? As written everything is a 1st level or higher ability (as 1 divided by 2 rounded up is still 1 and nobody get 0 level class features).

What action is it to cast a constant class feature? Also constant class features are right now much worse than usage ones.

Also you mention mysteries so I assume you are familiar with ToM so would vestiges be a constant or usage ability? The bind normally has a duration (24 hours).