Basic d20 Natural Advancement

From the Introduction: Basic d20 is a simplified version of the d20 system suitable for use in any d20-based campaign. This system has been designed for quick character generation and ease of play. The focus is to make it simpler for players. The GM, however, must be well-versed in the d20 system to make use of this set of rules. The normal Basic d20 system uses the concept of Power Points from Mutants & Masterminds for player character advancement. This document details a simple, alternate advancement system for characters.