One of the new optional rules is a different level of difficulty for spellcasting depending on the caster's and the spell's rank. Great idea, but I noticed that for my player's Rank 1 wizard, casting one of his Rank 1 spells has just gone up from a 0 challenge die task to a 2 challenge die task. Seems a bit of a rough jump, and a big increase in spellcasting difficulty for beginning spellcasters if you use this optional rule.
Or have I got something wrong?