Talk:Legend of Dragon Gods Revisited (2015)/@comment-27360589-20151207140514/@comment-25090105-20151207160733

Yeah, any spirit will do. You can fuse Fire Slime (+0) and Fire Slime (+0) to get a Fire Slime (+1), as an example.

The Bahamuts need to be at their S form because that's the only form that has 5 hipos. If you fuse them earlier than S, you'll waste one hipo or two.

The last step to fully unlock a spirit usually is what you describe: fuse two copies of their final evo stage with some hipos unlocked beforehand.