2017/06/05

OSR: Teleport Spells (and also math)

Teleport spells in my game are very rare and very dangerous. Most wizards refuse to store them in their brains and use scrolls or wands instead. A teleport spell is convinced that two objects need to be switched. It exchanges them with a thunderclap of displaced air. The two objects have to be of approximately equal mass. Teleport spells sometimes get over-eager. If your fireballs spell gets excited you might get a headache or shoot flames from your nose. If a teleport spell gets excited, it might swap your brain (or part of it) with a nearby object. It's better to lose a scroll or a wand than your frontal lobes.

The latitude between the two objects also matters. We're going to use some approximations to make the math convenient. If you want to more precision, I'd have to ask "why?"

This might seem fiddly, but teleport spells are rare enough that the extra rules won't slow the game down. You can also eyeball results pretty easily.

Creation rotates at approximately 1000 miles per hour at the equator, decreasing by the cosine of your lattitude (in degrees) as you move away from the equator. (The equator is 0 degrees, the poles are 90 degrees). A parallel of latitude is about 72 miles. If you were on the equator and you walked 7 parallels north (504 miles), your rotational speed would decrease to (cosine(7)= 0.993, 0.993 x 1000 mph = 993 mph.) Conveniently, 72 miles is 12x 6 mile hexes.

Here's how the table works. Let's say you want to teleport one hex north. You are currently on the 20th parallel. If you moved all the way to the 21st parallel (12 hexes), you'd gain 6.1 miles per hour. But you are only moving one hex, so you gain (6.1/12) 0.5 miles per hour. That's a brisk tortoise pace, so air resistance cancels it out almost instantly. You arrive (or the object you swap with) arrives with a slight jolt.

Let's say you want to teleport from the 20th parallel to the 59th. Sum all the speed gain from the 21st to the 59th parallels to get 424.7 miles per hour. That's pretty quick. If you arrive at that speed, you'll fly through the air like a ragdoll and die. Air resistance will knock you unconscious. It's better to have the object you're swapping with take that speed (if you can fine-tune the spell). You'll arrive with a thump. It will arrive with a thunderclap, speed through the air, smack into something, and explode. The direction is due west (if moving closer to the equator) or due east (if moving further from it). I think. Someone check my math here.

As a general rule, you transfer 1d100% of your speed + 10% for every dice (or level) you invest in the spell + 10% for every time you've cast this particular teleport spell. 


For example, a wizard who invests 3 MD in a spell and has cast it twice before gets to transfer 1d00+50% of their speed to the swapped object.

Example Spells:



Royal Teleport
R: Creation T: 2 people or objects, 1 must be the caster D: instant
The caster, and any number of willing people or objects touching the caster, teleport to a designated location the caster has seen before or knows well enough to visualize. The spell swaps the caster, etc. with an equal mass of royalty from near the arrival area. If no royalty can be located, the spell fails. Dead royals, crowns, thrones, paintings, tapestries, archbishops, cardinals, and history books all count. Living royalty may Save to resist destiny. 

Blanchford's Aquatic Miracle

R: Creation T: 2 people or objects, 1 must be the caster D: instant
The caster, and any number of willing people or objects touching the caster, teleport to a designated location the caster has seen before or knows well enough to visualize. The location must be near water or underwater. The caster, etc. appear underwater, 1d10 meters down. The spell swaps them with an equal mass of water. Bear in mind that traveling quickly through water is much more dangerous than traveling quickly through air. Increase all damage by 1d6. Most wizards who use this spell wear specialized suits with hydrodynamic hats and pauldrons.




ParallelMiles BetweenHexes BetweenMile Per Hour GainCities (North)Cities (South)
0000
172120.2Nairobi
272120.5
372120.8
472121.1
572121.4
672121.7
772122.0
872122.3
972122.6
1072122.9
1172123.2
1272123.5
1372123.8Bangkok
1472124.1Guatemala City
1572124.4Brasília
1672124.7
1772125.0
1872125.2
1972125.5Mexico City
2072125.8
2172126.1Honolulu
2272126.4Rio de Janeiro
2372126.7
2472127.0
2572127.2
2672127.5Johannesburg
2772127.8Brisbane
2872128.1
2972128.3
3072128.6
3172128.9ShanghaiCórdoba
3272129.1
3372129.4
3472129.6Los Angeles Buenos Aires
3572129.9KyotoCanberra
36721210.1
37721210.4Melbourne
38721210.6Washington
39721210.9
40721211.1New York City
41721211.3Wellington
42721211.6Rome
43721211.8
44721212.0Minneapolis
45721212.2
46721212.4
47721212.7
48721212.9Paris
49721213.1Vancouver
50721213.3
51721213.5London
52721213.7
53721213.8Dublin
54721214.0Ushuaia
55721214.2Moscow 
56721214.4
57721214.6Inverness
58721214.7
59721214.9Oslo
60721215.0
61721215.2
62721215.3
63721215.5Trondheim
64721215.6
65721215.8
66721215.9
67721216.0
68721216.1Inuvik
69721216.2
70721216.3
71721216.5
72721216.6
73721216.6
74721216.7
75721216.8
76721216.9
77721217.0
78721217.0
79721217.1
80721217.2
81721217.2
82721217.3
83721217.3
84721217.3
85721217.4
86721217.4
87721217.4
88721217.4
89721217.4
90721217.5


Speed Example Danger
0.1 mph Snail Speed None
0.5 mph Fast Tortoise Speed None
3 mph Walking Pace Save vs Dex or fall down (no damage)
5 mph Brisk jog Save vs Dex or fall down (1 damage)
10 mph Running Speed Save vs Dex or 1d4 damage. 
25 mph Sprint Save vs Dex or 1d6 damage. Need at least 20' to slow down.
40 mph Dangerous Sprint Faster than you can run by your own power. Save vs Dex or 1d6 damage. Need at least 50' to slow down.
50 mph Tumble Cannot keep footing. 1d6 damage, prone, and stunned for 1 minute.
100 mph Car Accident No time to touch ground. 2d6 damage, prone, Save vs another 1d6 damage.
200 mph Major Car Accident 4d6 damage, 1 fatal wound, and Save vs another 2d6 damage. You fly across the landscape.
More Mangled Probably dead. -10 HP, 1d6 fatal wounds.

No comments:

Post a Comment