The Ka-Teni have a number of useful devices and discoveries that allow them to survive in their mountain home.

Fortifying Tea. Made from tea trees high in the mountains of the Ka-Teni, this hot drink allows humanoid creatures that consume it to ignore one level of fatigue for up to four hours. Making the tea also consumes 1 Supply, but will results in 8 doses of tea and may be stored to drink cold for up to a week.

Portable Altimeter. This device has a number of air bladders inside it, allowing it to measure relative altitude. The pressure-sensitive device can also detect when bad weather is coming, giving advance warning of snow and other storms. You can accurately read the device with a DC 10 Engineering or Survival. A successful read grants you an expertise die on checks and saving throws to navigate snow storms or similar conditions. However, if you take thunder damage, the device is damaged. It can be repaired with a DC 10 jeweler’s tools check.

Skis. Finely polished planks strapped to the boots of the wearer,skis allow for swift crosscountry and down-hill travel in snow. It takes 5 minutes to don or doff skis (though the ties can be cut as an action, the skis are then considered broken). In difficult terrain caused by heavy snow, you can take the Dash action as a bonus action across level ground or the Sprint action as a bonus action if going downhill. While wearing skis you have disadvantage on Dexterity saving throws unless you choose to throw yourself prone.

Snow Goggles. Sunlight on snow can cause a blinding glare, resulting in severe pain and disorientation for many creatures. Snow goggles, made from wood or bone, have a small eye slit carved into them in order to cut this glare.This allows the wearer to operate normally when otherwise they would suffer disadvantage to Survival checks and ranged attacks. While wearing the goggles, you suffer disadvantage on Perception checks related to sight.

Snow Shoes. Large wicker constructions with a broad sole, these prevent the wearer from sinking into snow. Donning these shoes takes two minutes and allows the wearer to only decrease their movement speed by 5 feet instead of halving it when on difficult terrain caused by snow. Shoes must be worn on all feet to gain the benefits. They cause disadvantage on Dexterity saving throws, but grant an expertise die (+3) to the DC for resisting knockdown attempts.