i think the progression of solas' friendship with the Other Wisdom Spirit is very neat, bc i think it would be like:
solas is convinced/manipulated to semi-reluctantly take a form for the Greater Good. immediately starts to regret it, and is sent off to fight the titans/dwarves/other elves at various times
he still stays in contact with the other wisdom spirit, but is very vehemently like "do NOT make a body like i did, it's really depressing over here :/ no one likes my ted talks and they keep telling me to kill stuff :/"
the wisdom spirit doesn't fully understand solas now, bc he has different priorities and senses and ways of interacting with the world. so it keeps popping up like "hello my dear friend :) do you want to hang out and share cool facts between each other for 200 years like we used to? :)" and solas is like "i would love to, but actually i can only spare like 2 hours and then i have to get back to combat :/"
and then both of them recognize that they can't quite relate to each other in the same way now. solas thinks "hm well. that makes sense, i'm obviously not a wisdom spirit based creature anymore, i've corrupted into pride :/ invariable consequence of taking a body :/ i'm just built different and worse now :/"
and then this spirit manages to hang on through the collapse of arlathan and several thousand years of thedas, perhaps because solas warned it so strongly against coming near the physical world? and then... it gets killed bc some chumps from kirkwall (derogatory) decide to summon it for combat.
which is also solas' fault technically, bc they probably wouldn't have done that if the conclave hadn't blown up. and then he gets so sad that he briefly considers giving up on the orb and his mission entirely, and letting the world end. fdskjhfjsdf