Let me answer some of your questions. The snowfall is caused by magic. WInter's Fury is a character you encounter who does use ice magic. The snowfall was supposed to simulate that and it is explained much more in the next update that is coming. As for the blood scene itself, that was more of a dream not an actual event that happened. If that is not clear, we can make some edits.
For Melmond's scar, he actually has two scars. A scar across his eye on his right eye. and a lightning scar on his left eye. So that may be what you are confused about. The lightning scar does not show on his younger character because it happened after the fact.
Any other questions, I can try to answer to the best of my ability.