Need EQ Rewards to be Reworked
It's been a long time since the rewards for Event Quests stand still and the rewards are poor too.
1k 5 star shards for Heroic Exploration and
2.5k 5 star shards for Master Exploration.
So you'll have to wait for 2-3 months for opening a 5 star Crystal.
And 4 star shards too.
Overall the rewards sre Poor