User blog comment:Garr9988/New Mission/@comment-4820455-20170804012431

With the doorknob if you look, when they place the doorknob in his hand there is instant pain, but is calmed by the phoenix. Also every time the phonix was ever used it wasnt from an artifact causing fire like the doorknob.

Plus, the effects of mixing these artifacts would really be unpredictable.

Here you have the Doorknob, which causes combustion when held and the Phoenix that prevents the user from combusting. An unstoppable force meeting an unmoveable object.