These both were cast alive into a lake of fire burning with brimstone. And the devil that deceived them was cast into the lake of fire and brimstone, where the beast and the false prophet are, and shall be tormented day and night for ever and ever. False prophets come in peace, but have another agenda. They come looking like one thing when, in fact, they are another. No matter what someone pretends to be, what they are will always come to the surface and become manifest to everyone.
False prophets are capable of showing signs and wonders.
Jesus, Himself, rebuked people for pursuing Him because of miracles, referring to them as things that do not endure. The false prophet BarJesus sought to turn Sergius Paulus away from the faith. So also do false prophets withstand the truth and seek to cast stumblingblocks before those presenting the word and those who would receive it. Therefore, false prophets sprinkle a little truth here and there in the midst of the garbage they preach. The doctrines taught and methods embraced by false prophets result in resistance to the truth.