This builds off my question about the Spellwarped Template, and the fact that its speed increases, RAW, are permanent and stack. So let's begin.We're going to build us a Santa who can deliver presents to all the good children of your campaign setting of choice in one night- the Winter Solstice. We're assuming one toy per child, approximately 1 child per two adults (actually less), and a total world population of 1 billion (as per the USCB world population estimates for 1850. Reasons include medieval farming techniques mixed with the existence of clerics). First let's do some math.
With 1 billion people, we've got to narrow down to see how many children Santa's got to deliver to. So let's assume that there's approximately one child for every two adults. This means there are 333,300,000 children in this hypothetical campaign setting. However, Santa's not going to deliver gifts to every one of them- the naughty list is a thing after all. Let's assume an equal number of children of each alignment (Chaotic evil Orc and Goblin children, lawful evil bugbear children, neutral evil other children). That would leave us with about 37,033,000 children of each alignment. So since evil children don't get gifts, and chaotic neutral children probably get coal for naughtiness, that leaves us with five alignments- and 185,166,667 toys for Santa to deliver. That's still a lot of houses to hit in one night.
Now, here's the thing- Santa would actually probably travel faster with the Spellwarped template than he would using reindeer. So let's assume the reindeer are what he uses to get back to his workshop. No, instead Santa is a very quick man thanks to his magical Spellwarped Template. To make sure he's fast enough, every time he speaks the command word (Ho!) his belt casts a 4th-level spell on him as a 7-th level wizard- not enough to puncture ECL 20 Santa's SR 28. However, the spell from his belt increases his ground speed by a full 20 feet with every laugh. This raises the question of how Santa travels over water, carries the toys, and gets into houses.
Magic items again. By pressing his nose as a free action, Santa activates his Quickened Dimension Door ring, allowing him to bypass locks and gates in order to deliver gifts and return at will. To get to higher ground, Santa need only don his magical airwalking boots to have the spell continuously active. He holds a magic sack which is actually a portal to a genesis'd demiplane. With Quick Draw, he can take the presents from the bag as he passes through each home and drop them as a free action.
And of course, when his rounds are done, he sits in his sleigh, hitches up his magic Dire Elks, and activates his final magic item for the night. When he shouts "MERRY SOLSTICE TO ALL, AND TO ALL A GOOD NIGHT!", Santa's sleigh casts Gate to return him to the workshop to begin preparations for next year. The legendary Santa Claus, Wedded to History (as a Elder of Legend), has made his rounds.
The consequences of this are rather interesting- Santa's coming is not heralded by the gentle ringing of sleigh bells, but by a sonic boom. Christmas trees are there to give Santa a target for dropping the gifts so they don't punch holes in the walls from momentum. And if I could figure out how, Santa would go give every Evil-aligned child a black eye and a note with a stern warning for the Solstice.