I was wondering if anyone can shed some light on the Frontier Shell and its option to 'Infuse' it. The option is there but whenever I select it it states that I don't have the items (ghosts). It has a defense of 3 and I have two other rare ghost shells with a defense of 170 and 190 so I thought I would be able to use them to infuse it.
I also have a Brave Shell which I was able to successfully infuse up to defense 186 with a rare ghost shell.
So is this a bug or am I missing something? If it can't be infused why is the option there?
Any help/insight would be appreciated?