This is for Shifty ONLY!!
Shifty: i've passed all that. I'm up to the *next half* of the game. You can go to either marker first. I'm just doing the south one first. Which reminds me. Have you been to the fire or ice mountain? If you haven't, go there. And since you've gotten the warp song from the second frog god, you should be able to go to a certain place that lets you go to fire and ice mountain. figure it out. you can do it. if you haven't done anything yet, just ask me. PIAC can tell you stuff, i dunno about Infernal, but don't ask Mario, cause he's only up to the 2nd visit to forsaken fortress.
And if you want some more Knight's Crests, just look for battles with those knights in armours. When you've taken all their armour off (do PARRY MOVES ONLY to do this), get you grappling hook out, and take it from them. You can do this with any enemy. If you want just one more, go to Shark Island, and hit all the switches. It'll be the most intense battle EVER, but there are knights down there.