Currently, the reactions we have are mostly restricted to one of three reagents, blood, water and plasma. There's the small exception of sugar for the slime jelly reaction, but that one's so rarely used it doesn't even really matter. What I'd like to see is more reasons for Xenobiology to interact with other departments, specifically chemistry. I'll lay out a few examples of possible reactions here, and in some I'll leave the required reagents up to the devs, as there's no fun in knowing exactly what to inject.
1) Cryoxadone + Dark blue slime core = all nearby players are rendered immobile for a short time as they are temporarily frozen. No lasting damage, and it would catch whoever caused the reaction too, unless some alternate method was used to inject the core.
2) Space Cleaner + Red slime core = clean floors. Nice and easy way to clean xenobiology up, and would give more of a reason to breed red slimes in the first place.
3) ??? + Light Pink slime core = healing burst. Could heal light genetic damage too, allowing xenobiology to treat itself, however the chemicals would probably have to be obtained from chemistry, something like Tricordrazine. Would be useful in emergency situations where a lot of wounded need to be treated quickly.
4) Some kind of soporic effect. Leaving this one up entirely to the devs, but again I think rewarding finding ways to trigger a reaction without being affected yourself is nice. If you can trigger this without being nearby as an antag, you suddenly have a very sleepy victim ready to grab.
5) Black slime core + ????? = Super advanced mutation toxin. Probably needs a better name. This is the one that I assume is least likely to get implemented, but it's a neat idea and I want to at least throw it in there. Injecting somebody with this would cause them to transform into a playable blob, similar to the gamemode present on some other servers. The chemical needed for this should be something you'll have a hard time explaining to chemistry, so that it's not just handed away freely to any antag xenobiologists who ask for it. That way, it shouldn't happen too frequently and should be a fun event that happens later into the round when it does. Optionally, could also cause an explosion before transformation, severely damaging all other nearby players, the idea being to prevent an antag from zipping around and injecting stunned/KOd players.
6) Yellow slime core + ??? = Robotic repair effect, similar to the pulse effect of some anomalies.
These are just a few ideas I came up with, if anybody else wants to stick some on as well in a reply feel free to do so. I think it would make Xenobiology a lot more interesting if they could create useful interactions like this, and more useful but potentially dangerous antag tools. It would also give Xenobiologists more excuse to leave their labs, visiting chemistry, delivering pink slime cores to medical, etc.
