You are standing in an open field west of a white house, with a boarded front door.
There is a small mailbox here.
You sit with your flippers in a lotus position, turn inward, and contemplate the unbearable lightness of being.
Your dorsal fin itches.
You remove a jacinth gem worth over 1,000 gp and an ornately carved bar of silver worth over 100 gp from your backpack, crush them in a mortar and pestle, mix with pixie blood and salamander spit, inscribe a hexagon upon the earth, then spend an hour in an ornate ritual of dancing and chanting. At the end of this ritual your body collapses but your spirit collapses to a point of the brightest light and speeds through a portal to the Astral Plane.
You are floating on a featureless plane of grey mist. There are no directions here but in what we’ll call the east, in the distance, you see a silouette.
There is a silver cord here. It comes out of your butt and reaches down into the featureless grey mist.
Your mind whirls at the possibilities inherent on the astral plane, but settles on an odd question-- how does a shark become a wizard? Perhaps they have their own magic schools like your species, the Bottlenosed Dolphin?
While you ponder this question, a crew of githyanki sneak up behind you. One draws his vorpal sword and swings at your silver cord. Being that you are a powerful and canny dophin wizard who’s been around the block a time or two this activates your Contigency spell, triggering a powerful conjuration spell and incidentally disintegrating a diamond worth over 5000 gp in your backpack. A Gate opens, and through slithers the Aboleth Psi-Ninja you summoned by its name, which I will not reproduce here because it sounds like an upper respiratory infection.
A grand melee ensues.
Alarmed by the gruesome sight of a githyanki trying to tear its own arm off under mind control from the Aboleth Psi-Ninja, you involuntarily make a clicking kee-kee-kee-ahh sound. It is adorable.
You flip fin over tail in a display of silvery grace never before seen out of the water and rapidly swim away through the Astral Plane. You could really go for a nice wriggling mackerel or sardine right around now, and that silver cord is leading up to one heck of a wedgie, but you continue, you persevere, content in the knowledge that you successfully derailed this thread.