That is it. Skill ranks are simply +5% per rank to the base. Each skill has a base cost in experience, and that cost times rank being purchased is the total cost per rank. Harder skills have higher base costs.
For example; Spell Casting has a base cost of 5, Cook has a base cost of 2. So they progress as;
Spell Casting: 5,10,15,20,25,30,35,40,45,50
Cook: 2,4,6,8,10,12,14,16,20
You fulfill any training requirements the GM asks for, pay the experience, and add 5% to the skill total.
In the example above, Cook is Knowledge based so 45 base plus one level. If the skill was not taken, default is base minus cost times 5, or 35% for this pc to 'cook' with no skill level.
There is a very comprehensive skill list with base cost, controlling stat, and descriptions. New pcs get a background, professional, and secondary skill list and total them. It's a basic 'life path' skill system. The base costs range from 2 to 5.
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