SOTA LORE
What Skills Cost to Level
Raising skill levels costs Adventure or Crafting Experience (XP). The amount of XP required is exponential in nature, causing higher-levels to cost considerably more than lower-levels.
The chart below can help visualize the cost of raising skills. Change the Max Skill Level and Factor Cost to get an idea of the XP requirements to get a skill to a particular level.
Along with the base XP cost, each skill also has a Factor Cost. This is a simple multiplier to the calculated XP cost.
Most skills have a Factor Cost of 1. This commonly applies to active skills (e.g., red, yellow, or blue glyphs).
Passive skills (i.e., grey glyphs) quite often have a Factor Cost of 4.
Specializations and wardings (and a couple others) have a Factor Cost of 20.
Check the Adventure and Crafting tabs above for the cost of each individual skill.
Notes About Skill XP Math
The calcuations used on this site differ from other tools I've seen. A lot of other tools use a "lookup" table to calculate the total amount of XP for a particular skill level between 1 and 200. In my testing, some of these appeared to be inaccurate (although, still very useful, as the inaccuracies are relatively small). So, instead, I've chosen to use a function to calculate required XP. I'm convinced this function is also slightly inaccurate, but close enough to be useful.
That XP required function for a skill level is as follows (note that ** is the power operator)...
XP = (xpFactorValue * (Math.ceil(((1.099711**(level-1)) - 1) * 100)))