Belle & Bellicosity is a mod I've made to add technologies to Stellaris to allow for the user to unlock, through Sociological research, more potent relations with others; whether they want to make friends or enemies.
The mod consists of 12 technologies - Belle Relations I through V, Bellicosity I through V, Belle & Bellicosity, and Xeno Relations. Belle Relations techs unlock an additional Embassy (which is only relevant if you have installed another mod which re-enables Embassies; I suggest King Lemming's addon) and grant +5% Trust Gain, Bellicosity techs unlock an additional Rivalry and +5% Rivalry Influence Gain.
You must research both on any given tier to unlock the next tier. When you've researched all ten, Belle & Bellicosity, a very expensive tech, becomes available, which increases both Embassies and Rivalries by 1, and Trust Gain and Rivalry Influence Gain by +25%. Having researched Belle & Bellicosity, Xeno Relations, a repeatable technology, becomes available for research, which increases embassies and rivalries by 1 each, and Trust and Rivalry Influence Gain by 7.5%.
As a bonus, the technologies tell a trite little tale as they're researched, so mouseover them for their descriptions at least once, okay?
Huge shout-out to the folks who made More Technologies. I didn't rip off any of your code, but I did crack More Technologies open to figure out how to make mine work.
Note: The standard version is tuned for use with my Shadow's Defines mod. If you don't use Shadow's Defines, or some other mod which eliminates the mounting technology costs by population and colony number, the tech costs in Belle & Bellicosity will be huge. For this purpose, I made the Vanilla Tech Costs edition instead. If you use the Vanilla TC version with a mod that does not flatten the escalating tech costs, then Belle & Bellicosity will be quite cheap by comparison. If that's your thing, go nuts!