Fantasy World Builder

Help me build a fantasy world with: Core concept: [CONCEPT]. Magic system rules: [MAGIC_RULES]. World name: [NAME]. Create: 1) World geography and climate overview, 2) 3 major civilizations with distinct cultures, 3) Political power structures, 4) History timeline (5 major events), 5) Magic system limitations and costs, 6) Religious/spiritual beliefs, 7) Unique flora/fauna, 8) Current conflict driving the story. Make it internally consistent.