Talk:Meso Z1/@comment-85.207.39.50-20180715104700/@comment-36266827-20180727192303

The tier system is left over from the tower system that was rotated out in warframe.

Nowadays the tiers stand for the level ranges different missions have. Here's a guide to the current tier system:
 * Tier 1: Level 1 - 25
 * Tier 2: Level 25 - 45
 * Tier 3:: Level 45 +