How can you play if your strategy heavily depends on whether you get the Earth element early on?
If you get the Earth element at level 4 and receive the slow effect, you can clear objectives in the first week that a player without mass slow can only clear in the second week.
So, how do you play this game? (You can't)
The physics guide states that a Warrior gets an element every 4 levels. If an element appears earlier, another element will appear in the next 4 levels. If the Earth element doesn't appear, switch to another element or level up a Mage, as Mages get an element every 3 levels. The physics guide explains this.