like i said how do you get endurance mode? i dont have that option nor the talisman. do i have to get to a certain level?

going for 100% achievements

I played Chasing Shadows and loved it, the progression is just on point, challenging but never got stuck. Now this game I have played for weeks at a time and always end up dropping it, I get stuck and frustrated, it's hard to farm mana, I don't really like the puzzle pieces system, the farming feels boring. Am I doing something wrong or is the game supposed to be that different from Chasing Shadows? Any tips? Is there a YT video you can recommend me to git gud?...

My stats show I have thousands of orb explosion kills but the achievement is still locked. Any ideas?

Does "Nearest to Orb" mean the enemy closest in a straight line to the orb, or is it the one closest to the orb by the earth's path (considering walls, obstacles...)? Subsidiary question: Does this differ according to the type of enemy (ground, flying)? Yesterday, I had built a labyrinth and I had the impression that the program was completely ignoring the walls for ground units in order to determine the closest unit to my orb....