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[Anomalocaris]

runic script, the earliest written form of Germanic languages, seems to be derived from Etruscan script, an undeciphered but greek derived script of a pre-roman native language from central Italy.

the mystery is the earliest attested Runic script was from the end of first century A.D., But the height of a Truscon cultural influence was 4 centuries before that, and by the beginning of first century A.D., only a few antiquarians and the scholars in rome could still read the Etruscan script.  how did the Germanic people come to adapt the form of Etruscan script for their own alphabet?

Not much of a mystery. The earliest attested Runic script doesn’t necessarily mean the first Runic script - it’s just the earliest one we know of. It’s possible that the Germanic people were using runes well before 100AD, which, coincidentally is roughly when the remaining Etruscans abandoned their script for the Latin alphabet.

Boru

It seems likely Etruscan script was transmitted to the Germans via a Celtic intermediary at an earlier date when Etruscan cultural and commercial influence in Northern Italy was still strong, maybe before 2nd - 3rd century BC.  the mystery is we have no other evidence if it so we don’t know how that happened.    We know by 60AD Etruscan has fallen completely out of daily use and the number of people who could read Etruscan script or even understand the spoken language was very few, and the Emperor Claudius felt compelled to compiled a dictionary to preserve the language because many of Rome’s traditional religious rites and texts were inherited from the Etruscans,  and these still held a revered central role in Roman religion despite the effective death of the language itself.