I was always using Habetrot on first turn since I was afraid, and too lazy to check, that Oberon's drain happens after her death lol. Thanks for confirming.

While it does work, the damage is really lacking most of the time. For aoe buster servants with small or no batteries I'd greatly prefer to clear the first wave with chen gong and clear 2 waves with the servant you want to use because any buster servant can clear 2 waves with black grail if you already have the ability to do the setup in your video. Just borrow a koyanskaya instead of an Oberon (I borrow Oberon because I'm not rolling for him). Here's an example using the Bunyan in your video. One note is if you don't have merciless one CE you need at least lv 1 append if you have no battery. I used this node because of the high hp enemy in the last wave and it's a bad situation for chen gong but it still works. RNG is worst case too.

It's not a matter of how effective it is, it's just that you can do it (with your favorite servant) :P

Dear @Brichards719

Everyone's is free to use whenever setup they like. It's not like if someone uses a setup that's different than yours you need to criticize it.

This a game, not a competition. If you think your setup is better free to use it. Nobody will judge you. But be aware that what you said may work with other enemy classes but not Rider (unless you're Chen Gong is lv 90+ and has at least 1000/1000 ATK+DEF). Plus I'm referring to main quest node, not free. I admit that my setup lacks a little bit of damage (don't have Koyanskaya sadly😢). This video was made with the purpose to help people use whoever servant they want without Arash/Gong on first row (which is kinda rookie and obvious and everyone knowledgeable setup.). I hope that I've been of use to them (that would make me really happy)

Don't get the wrong idea. I wasn't criticizing your setup at all. I only added that setup to show people that massive damage is possible for 2 waves with even the buster servants considered to be among the worst if one of those happens to be someone's favorite.