The Rules

Skill ranks are abolished. Instead, all characters gain a bonus to their skills equal to half their level. Other bonuses, such as attribute bonuses, are figured normally. Skill Focus now grants a +5 bonus rather than +3. Skill Aptitude grants +3 to 2 skills rather than +2.

At each level, give each of your class skills a rank (they're unabolished with a new purpose ^_^). When you use a skill with at least 4 ranks, roll 2d20 and take the highest value. At 9 ranks roll 3d20, and at 16 ranks roll 4d20. (This pattern can be easily extended to higher levels. At 25 ranks roll 5d20, at 36 ranks roll 6d20, etc.)

The Reasoning

The first paragraph is identical to Saga. No real explanation necessary.

The second paragraph is a replacement for Trained skills. Putting Trained skills in Iron Saga would require porting over the Saga skill system entirely (which definitely violates copyright) or designing Trained uses for skills for the D&D skill system (which is too much work). Using a multi-dice mechanic is a simple, easy replacement that represents the consistency that experience brings. Plus, rolling higher numbers is fun!

For those of you concerned about rolling more dice (or considering this somewhat hypocritical given my reasoning for preferring the Saga attack system), note that this isn't actually multiple rolls with varying bonuses, like D&D's full-attack action requires. You just roll a bunch of dice at once and find the highest, then treat it like normal. The additional time taken is nearly trivial.