Hnefatafl is an ancient Scandinavian board game whose variants were played all over medieval Europe before chess was even invented. In those so called Tafl games two different sized armies fight each other. The invading black army tries to capture the white king, while the defending white army tries to protect their king and help him escape.
According to the antivirus report, this application doesn't contain viruses or any kind of malware. Philippe Schober is the official developer of the app that can be found in the Board Games category. The developer rolled out a new version of the game on Sep 22, 2020 and over 100K users downloaded and set up Hnefatafl.