You need to have the Portal Elixir to go through the portal. The Portal Elixir Kit is trade-friendly so you'll be able to trade gold / items for it even if you don't want to spend Platinum.
This has been addressed for this year: Egg-Zavier no longer has a massive health pool; he uses 'single point' damage and requires a few dozen hits to die. This makes it pretty evenly balanced between the lowest levels with the worst gear and endgame players with full Star Beast, etc.
The Egg-Zavier Triple Deviled Crate are unlimited.
Best wishes!
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