google what does crux means.
crux. n, pl cruxes or cruces (ËkruËsiËz). 1. a vital or decisive stage, point, etc (often in the phrase the crux of the matter). 2. a baffling problem or difficulty. 3. (Mountaineering) mountaineering the most difficult and often decisive part of a climb or pitch. 4. (Heraldry) a rare word for cross.