To enter trials hard mode you would receive a hard mode trials passage which you would receive from the lighthouse chest. So essentially to enter hard you would have needed to go flawless that weekend. It would require the same the same 9-0 to go flawless with 9 wins or 3 losses to complete it. There would be boons except with one boon which acts somewhat like mercy but if you lose you wouldn't receive a loss it would take away from a win on that card. If you have no wins then it just counts as a loss.
Rewards I feel 5 wins should reward an adept piece 7 for an adept weapon and for flawless a guaranteed max adept weapon and amour piece with a max light trials specific exotic. This reward would be across all characters. You would also receive an exotic emblem, shader and ship the first time you go flawless. You can select this feature by selecting the difficulty before you click launch.
Edit 1- Seems people feel the rewards are a bit too much so maybe a max light armour piece or weapon with a chance of a trials specific exotic
Edit2- We're trending
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1.) No exotic emblem, ship, or shader. There are currently none of those for PvE. If PvE gets them, then so can PvP. 2.) Make the Hard mode have Inferno rules.