Hi Lethani, have you tested this extensively in co-op? A few I have spotted so far in a Co-op ME Sisters/Drycha game:

1. The UI thing where we can't see the currency (impact: very low)
2. Drycha player does not get Ariel Investigates (intentional?, impact: none if intentional, low otherwise)
3. Possibly causing CTD in post-battle (possibly if an Ariel Investigates ingredient is picked up by the player who does not have Ariel investigates as per point 2? we had it consistently after siegeing Drakenhof), impact: high :(

Hi BenSkup,
I can't say much about multiplayer because I never play it and never test there. That Drycha doesn't get "Ariel's Investigates" is intentional (that wouldn't make much sense from the lore).

I can't say much about the CTD either, because I don't play multiplayer. I'll keep it in mind though, in case it shows up in singleplayer as well.

No worries, I know co-op is kinda niche! I did wonder if maybe the script for Ariel's items is running during Drycha's turn because the other player is playing Sisters? Maybe that is doing it, if it tries to deliver a research item and throws a null. Of course I can't remove Symbiosis to check if anything else is causing the ctd so it could also be something else. Only reason I thought maybe Symbiosis is we have had the same mod collection for our co-op games for a while and just added Symbiosis.