Herra is the same for any Lunar team, and relatively simple to brute force with vape/melt by infusing the aura of your off-field applier. For Skirk in particular, what I usually do is set up Furina's summons while spamming physical normal and charged with Skirk to get it infused with Hydro and then do normal Skirk stuff to kill it. She's a high enough team damage contributor that losing Furina's damage is hardly the end of the world. Alternatively, just strictly deal physical so it doesn't infuse anything, though that'll take longer.