I imagine anyone who's bashed ice larva has probably made something like this, but just in case, I thought I'd share the fruits of my dysentery-fueled misadventures.
https://www.dropbox.com/s/umecgvlflgjq3qb/Reflex Package Larva 2019-6-21.nxs?dl=0This will ensure you're always targeting the strongest currently living evolution of the larva and keep track of how many of each form is still around somewhere. It should work solo or in groups, but I haven't tested the third-person side of things.
lcheck displays a count of how many manes/imps/skulls/etc are still alive
lreset resets those counts to zero
Everything else, while perhaps not efficiently coded, is automatic.
(this package assumes you're using Nexus's default
@tar in your bashing aliases.