Did he? *Rereads* Well...

Double would attempt to find out the origin of the forest and it's weakness, Xtreme form's analysis being foiled by the fact that Hellheim isn't from Earth. Accell would just attempt to smash up as many Invess as possible.

OOO, having access to TaJaDol and PuToTyra, would be a pretty big threat, as he can both burn and freeze all the plants. [Proto]Birth would put up a pretty good fight too, I imagine.

Fourze would try to befriend DJ Sagara, as agreed earlier by me and GunCannon, and Meteor would attempt to punch him in the face for this. If you disagree, just remember Gentarou tried to befriend a space station once. If he actually decides to start fighting, he can use Fire States to burn it all!

Haruto has access to Flame Style, as well as Flame Dragon, so he can help with the burning of everything. Beast, as mentioned, can summon Chimera to eat the fruit without harm, so no more Invess can be formed from other organisms. The Mages can help out by punching stuff in the face with their over sized hands.

If Proto-Drive was around, I doubt he'd care. Thinking of this, I wonder how the world coped, having the Slowdown Catastrophe and Hellheim Invasion within several months of each other?

I want to point out that wizard is probably the most useful in destroying a forest, and this goes beyond just the kill it with fire. He could use land or hurricane styles to just straight up-root the forest, or just flood it with water styles. Furthermore he could repair the damage done, since from what I recall Helheim is more parasitic then Plant like, and is actually taking space from what was once the earth, by using land styles to cover up the charred remains of the forest, hurricane to spread seeds, and aqua to give water to the area. Or something like that I don't know, I haven't watched wizard yet.

That implies Wizard can actually do anything impressive with his powers. He can either shoot the elements or make funny smells. Or give himself a top hat :)

That was one of my biggest issues with Wizard. Hugely promising premise, awesome costume designs, but ultimately they just failed to do anything really interesting with it.

Empty writing, flat comedy and scheduling problems with the female lead (Koyomi). Wizard's problems in a nutshell.

If the plants in Heihelm is inflamable, what will Riders do?

they'd kick it dummy.
don't you know the ways of common raiders?

Thought Process of a Kamen Rider: There is a monster. Kick it. Didn't work? Kick it again. Still didn't work? Enter your Final Form and keep kicking it until it's dead.

If a bunch of Riders gathered to stop it, they probably would. Somehow. if there's anything I learned form Taisen movies, it's that the more Riders gathered together, the greater the chances something illogical will happen to give them the victory.

And if they decided to bring Sentai in too...I'd begin to feel bad for Helheim. The overly complex string of contrived false betrayals and unexplained plans would probably annihilate Helheim on the spot.