Does anyone know whatever happened to Arin's grapple gun? Did it vanish or am I blind?

Everyone's been talking about whether Arin has an elemental power, but I think the better question is whether or not he has a signature weapon like the OG ninjas. My mind immediately darted to his grapple gun, only to realise I nvr saw it in S3 part 2 or even S4. So did something happen to it or did I miss something?? submitted by /u/Far_Store_6739 [link] [comments]