What are the effects of raising skills above 100 (or 250, or higher)?
For some skills, this is obvious (like Prayer, Spell, and Alchemy, where you see the minuses and total chance of success). A weapon skill of 100 does theoretically mean that you hit 100% of the time, but since opponents dodge, block, and parry, you will still miss sometimes. However, high weapon skills lower the chances of these defenses working. Most skills, however, act like the previously mentioned Prayer & Magic — the skill represents a straight percentage, but there are penalties to the roll, so having a skill over 100 will negate these penalties.