Hello Arturs, please check "Lightning Storm" and "Haste" skills.
First, sometimes Lightning Storm can't deal damage in Blood Castles, Devil events etc (see attached video).
Second, Haste skill buff less attack speed when I'm in party (see attached screenshots).
Thanks
MUX Legend - Powered by IGCN - Name_ [Draziw] Level_ [384] Master Level_ [462] Resets_ [94] 2023-02-11 19-34-00 - Trim.mp4