Theese are NOT viking runes. They are an older Rune alphabet, from around year 500 and earlier. They are called the elder futhark. The viking Rune alphabets have usually only 16 runes and there are several different alphabets from that time.
Larp or alchemy? I can see this with a little burner and some of those coloured smoke pellets. Plus this is absolutely the box to open up on a desk to wow larp friends. --- Lovely leather medical bag for a LARP