So I just had my first game of 10e against a GW employee and he cleared up some rules for me though we both made some mistakes here and there. Imperial Knights played much like they did in 9th for me. It felt like playing House Vulker and House Taranis combined in a single lance. So, the Reroll 1's from the Chivic Oath is all 1's in the to hit or wound and the employee did make that clear. I won but only because I used my Painted models from 9th and he was using recently built mostly unpainted Necrons and because the Secondaries don't work very well with the crazy main mission and Mission rules we had.

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So Starting off this was Deploy Scrying Skulls and that is already wacky with Objective Markers in No Man's land are moveable at the end of each player's turn. Further this was Dawn of war Deployment so we were stupid close to each other's deployment for scoring mains. This is where I messed up with some deployment.

But it was the Mission Rules that made it weird. First, we drew Maelstrom of Battle which is draw two and play those unless you get Chilling rain. Well, we got Chilling Rain and Chosen Battlefield. Which meant draw two more and all Objectives are placeable by players on top of moving around. The next two we drew was Minefields and Hidden Supplies which mean Six objectives with only four really meaning anything to the main mission and Advancing could be dangerous. Neither of us was planning on Advancing.

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I got First Turn and had an Infiltrator, so I thought I had a decent advantage especially with the lack of real cover. Turns out Benefit of Cover was absurdly applicable basically all the time, further the Silver Tide Strat is killer if you stack it like it can be.

https://preview.redd.it/i52jvhqom38b1.jpg?width=808&format=pjpg&auto=webp&v=enabled&s=1e26a6a3929b3ed7675481469ae228acb5e1849c

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Popping his two Destroyer Units in Turn one left him lacking big weapons except on the Void Dragon who took out the beam Moriax easily. But Turn two I wiped Void Dragon and that little walker in the back that was buffing his tide. Unfortunately that Tide had stealth plus some other things that made killing it a challenge.

https://preview.redd.it/idkluazsm38b1.jpg?width=455&format=pjpg&auto=webp&v=enabled&s=e1b528fbb5937f36bb1b88761002d0bd40cdc954

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Basically they Tar killed both of my remaining Armigers, the Assassin got overwhelmed in Turn 1 by the tide that made the charge. Then the remaining game ended up with both of us with one unit tarred with each other but the objectives moved to his advantage. I out pointed him barely thanks to lucky secondary timing. It was a great back and forth match. I would not even been mad if I lost.

https://preview.redd.it/clw2m9hum38b1.jpg?width=455&format=pjpg&auto=webp&v=enabled&s=0d35e9b16c86b16fc4acb2f8b51f8dcae89d441d

Edit: My list.

Knight Crusader with Mythic Hero using RFBC

Armiger Moriax Double Laslock

Armiger Moriax Beam Cannon and Claw

Armiger Warglaive

Vindicare Assassin

His List I am not a hundred percent sure on what everything was so forgive vague descriptions.
Shard of the Void Dragon

Two Units of Two Destroyers

A walker thing that was buffing his Warrior blob

A 20-man Necron Warrior Blob with attached CyptoThralls x2, a Overlord, and some other leader that look vaguely Mechanical snake tail with beetle torso.