
Originally Posted by
Kashka
I'd suggest trying to get through 2-1(blacksmith), 2-2(ability to make super weapons & unlocks NPC with heavy arrows), 3-1 (Advanced spells NPC unlocked), and the beginning part of 4-2 (advanced miracles) decently quickly. Unlocking those things won't potentially mess anything else up, but there is more to unlock.
Also the red outline monsters are black phantoms. The ones that look like players but are not will only appear once a playthrough (the xbow/dagger one at the end of 3-1 is one of these). The ones that look like monsters are just stronger versions, and they come back. If you get invaded, which the game will let you know pretty clearly if you have been, the invader will have that same red outline too.