Acid Trap - Part 1 can be found on the middle pedestal on the Challenge Podium after you have completed 3 of the banner challenges. The second part is in the Temple on an end of one of the side rooms and it's a wooden gear on the floor. The third is also in another side room in the temple and it's a chain on a torch. You can now build the acid trap at either the Danu or Ra towers.
Acid Trap Souls - Now you will need to find four zombies of each element and have it die to that trap. Once you’ve all four you then need to kill the tigers with that trap.
Slide Trap - You need to purchase a spike trap and slide under it and you will have to purchase the acid trap and slide under it without taking damage. The easiest way to do the acid trap slide is to use the outside trap and not the inside then once you set it off immediately run and slide under it.
Immunity - Now you will be able to walk onto the fire and not take damage. To make that happen you will have to take damage from that fire then stand on it again and you will be immune. On normal traps you will take way less damage than before.