I guess the devs finally gave up at covering the leaks and decided to market sumeru themselves huh. This video is cool but it also confirms that dendro will really only have reactions with pyro aka burning, water aka bloom (leakers said overgrown) and electro aka catalyze (leakers said intensified) but it also shows that Dendro will
have triple reactions like some leakers said.
From what i can see at least on the video
Dendro + pyro = burning -> Should be a dot + double aplication
Burning + unknown = ???
Dendro + water = Bloom -> creates a small green seed and the SEED seed reacts to other elements.
Bloom + Pyro = The seed explodes presumably doing pyro dmg?
Bloom + Elec = The seed becomes a homing dendro (?) projectile and you get 1 elec particle
Bloom + hydro = not shown here but presumably the seed explodes doing dendro dmg yet scales with hydro char
Dendro + elec = Catalyze -> 1 elec particle and the enemy seems to be affected by both at the same time, presumably taking increased dmg from both elements too
Dendro traveler burst seems to create some sort of "permanent seed" or object that will keep proccing dendro reaction (you can see lisa shocking it).
This is certainly more interesting than i thought but they say they want it to be easy to understand when it already looks complicated and hard to setup. It will depend on praticity but it sounds like it will open a lot of new unique team comps and perhaps even teams that dont use anemo at all. Geo gets fucking nothing tho...