(some minor spoilers below)
TL;DR: give bats trophies so we can program the ballista to help defend against the Bat event.
With the Ballista *probably receiving new changes that allows players to "program" them to focus specific enemies, wouldn't it be a good idea to also give the ones that currently do not drop trophies upon death be able to do so?
Currently only Greylings, Ghosts, Oozers and Bats don't drop trophies. I don't think we'll be seeing Ghosts attack player bases any time soon (since they are not found outside Crypts and at this time there are no "ghost" events, although that actually sounds kinda scary/interesting), and since Greylings are pretty much harmless, the one occurrence where I think this would be super useful is the Bats' "You've Stirred The Cauldron"
You could make a case that the "A foul smell from the swamp" event could also merit Oozers getting their own trophy, and the same would also apply to "Skeleton Surprise" with Rancid Remains, but unlike these 2 events, the Bats Event is 100% compromised entirely of bats, so I see this as a higher priority (since you can have Blob/Skeleton trophies cover 99% of those events' enemies).
it would be nice if we can have Ballistae help defend against this event, which more often than not ends up with the Bats killing tons of innocents pets (for me its piggies, my chickens are under a roof). I know, I know, just add a roof/building for your piggies, but cmon, if Ballistae are going to be
"programmable", all enemies that raid bases should drop trophies so we can actually use these against them.
(these are already being tested per these*
Source: https://www.reddit.com/r/valheim/comments/10sgb13/bat_trophies/