SealedRune

If we perform a strings we find the flag encoded in base64 and then we reverse it to get the flag:

LmB9ZDNsNDN2M3JfYzFnNG1fM251cntCVEhgIHNpIGxsZXBzIHRlcmNlcyBlaFQ=
# base64 > reverse
The secret spell is `HTB{run3_m4g1c_r3v34l3d}`.