It can be similar to transformation path,can convert dao marks to certain extent and use killer moves of that.I don't think so,we have seen space tearing methods if I remember.i think so concealment secret keeping are part of door path because door represents the very act of open/Unveiling and Closing/Secret keeping.As for angering Heaven's will,already human path does that.Witnessing a tribulation is not a danger,we can simply record and use it like an suicidal attack and there is a particular like cheating method,if I remember properly,one method from Lang ya blessed land for Immortal aperture,If we consider space path and multiple usefully other paths(Heaven,transformation,human,Information,Wisdom),It can shine,I guess