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chimeras are a thing and likely a forbidden piece of knowledge right there and would likely cause a absurd amount of corruption to the target but has the potential for extreme amounts of power it was also associated with alchemy so the stone could easily have the potential for such a thing and so long and sufficient materials are used he can get very very power from this alone and since the world tree seed is considered a living thing it should be a viable target
so he seem to be a living humanoid personification of everything about the raven both real world and mythical and given how major ravens are in terms of mythology thats saying something plus ravens are one of the most clever creatures on earth and also have a tendency to horde treasure like little dragons(if you haven't noticed i like the birds in question) so ya he needs more raven appropriate powers to complete the set he already seems well on his way to completing
for psionics and espers why not have it be heavy science based in its application while combining it with some the stories magic features like affinity case and point like a affinity for electromagnetism or gravity maybe telepathy and so on but how it is used depends on the skill of the user and there own mastery of it
he has both the sun and moon divinity so the cosmos will likely be a important part of his empire and followers and a source for more divinities cosmic energy is a iconic power source alongside psionics and magic its just tends to show up only in scifi settings though only very rarely showing up in a fantasy setting so the three main sources for his people power and civilization wise is science(he already has the technology and biology divinities so this is obviously a thing), psionics(espers are planed already), and cosmic(the sun and moon divinities are already his he just has to figure out how to use them) celestials are the users of the power system for cosmic powers