God of War Ragnarök

How do you destroy the orange glowing cracks on the walls in God of War Ragnarok

What is with all of the bugs and creatures hanging around the game. Caves and pretty much everywhere else have these brightly colored bugs everywhere.

Four years have passed since we got a fading glimpse of Mjolnir as a shrouded figure stood outside Kratos' cabin. Excitement has been building as we get to put an end to this Norse-inspired entry to the God of War...