Trying to kill Adventurers that tresspass your land in the most creative ways
Eh, you already have defenses set up that start with swarms of Chihuahuas of War attacking them and only get stranger from there. Besides, after the first thousand, killing adventurers is a bit dull, even if you are getting creative. Granted, that is no excuse
not to be creative.
Try creating a new form of Un-life that is neither living or undead, but superior to both.
If it obeys us, cool, we have a new minion to play god with. If it rebels, we have an enemy to kill time fighting.
It turns out that the line between life and undeath is a bit "one or the other," as the only division between the two is the question of whether the entity has a soul or not.
Become a Demi-lich
That would reduce yourself to only a single part of your body. If you did that, you couldn't do anything with the tactile magics or those that utilize crafting as a component.
Become The Raddest Lich Lute player in all the land
You learned to play one when you were working on learning all the music-based magics. Going professional would be a bit difficult however. For one, you are just a skeleton, so you can't take copious amounts of drugs. For another, liches don't have the best reputations, despite your attempted public relations campaigns.
If it's a modern world with fantasy elements: Go and buy Fallout: New Vegas copy in the nearest store!
If it's a fantasy world: Summon skeletons and make them dance along with me.
You...actually aren't sure what the current tech level of the mortal races is. Probably want to check in on that sometime. Tech tends to progress really slowly, so even if its been a really long time, there probably hasn't been too much of an advancement. You idly wonder if you should contact some of the other liches you know over Skullbook using your custom-built
Deep Rot.
build a magitech mech out of bone, some supercharged super strength undead muscle (for extra punching power) and various other things and magic
Why bones? While it does keep with the aesthetic, there's a bunch of far stronger stuff that could be used. Sure, magic can bring the bones up to that same level, but those other substances are already there.