The Seal

Sadly for Antermina, the vacuum only eliminates the fire portion of the wall and "Firewall" not only keeps up the heat, but increases it. Got to love that Fire elemental powers also control heat.

As for the chain lightning, Tredixs forces it all to come into him and easily absorbs it without effort. The wall now moves rapidly forward, towards the Makuta to flush them out.  

Umbrax has the brilliant idea of using powerlanced versions of everything Antermina tries.

Antermina flinches away from Umbrax's skewed shot and applies liberal amounts of sonics to Tredixs' kanohi.

Artidax begins launching mental attacks on "Firewall".

Artidax uses his own power of magnetism to combat it, keeping their heads in the direction they should be.  He then activates his Mohtrek. Three Artidaxs appear and shapeshift into Manas.

Antermina flips gravity beyond the wall sideways, so as to make the toa fall into it.

Umbrax looses another one thousand times power blast of Slow, freezing the wall in place. He looks up and Power Lances Fragmentation through the ground and into Tredixs's foot armor.

Tredixs is still floating in the air, so Umbrax just destroys what once might have been considered nice flooring. Though it was getting old and probably needed something to replace it, so good on Umbrax for starting the DIY project of fixing up this place. 

For Antermina, the power scream hits "Firewall" and sends him flying back. He lets go over the wall, which under normal circumstances would make it fade away, but since it's under the affects of Slow, it remains. Going with a different plan, Tredixs sends a massive blasts of Lightning at the Makuta. 

Artidax manipulates the energy into his palm and dispels it. He then barks mental commands to his doubles and they return to their original forms and begin ganging-up on Firewall, blasting him with laser vision and bolts of disintegration.