Well, it looks like I can get home and without losing any time... I think! I checked on Derris Kharlan's World Tree, and the amount of mana it produces is unbelievable! Based on the output, I should be able to return home without harming the tree. Kratos says there's room for error with time and placement with this 'ritual' though. There's a chance I could be teleported inside of something solid, like a boulder, which would probably kill me... but hopefully that won't happen.
Also, I could end up returning a little before or after I went through that portal. Looks like the half-elves' research isn't complete yet, but I'm willing to take the risk. I already promised Raine I wouldn't disappear again after I got lost in the Ymir Forest, so I need to get back home, and I need to keep my promise to Kratos and give this Cruxis crystal to Lloyd.
Apparently, this ritual is only meant for emergency situations since doing it too often could harm the tree, so this is a one-time-thing. Well, I'm leaving soon. I hope I make it back in one piece. I did walk around a bit earlier and found a flower that only grows here in Derris Kharlan. It feels like a strange power's coming out of it. I plan to give it to Raine to see if she can make sense of it.
• Reference: Don't Ever Do That Again! / I'm Telling Him!