Firewalker can be found at apartment 202 in Sharpton Projects. To reach that apartment you have first to find apartment 306 on the 3rd floor hallway (sharpton interior). From there you climb down to the 2nd floor and head west, through a firedoor. The door has only a low quality keyed lock, so it is easy to pick.
At the 2nd floor of sharpton interior is apartment 204, which is also secured by an low quality keyed lock, together with an Ghost in that apartment.
Finally in apartment 204 is a hole down to apartment 202, but you cant reach that place due to extreme heat which the ghost Moms is producing. Kill that ghost with EMP grenades, climb down and you will get Firewalker.
Much quicker than throwing 10 EMP grenades: Give Nazkar a rock of crank and prepare for a fight.
This mutation grants:
+5-8 burn resistance +1-4 irradiation resistance +1-4 acid resistance
Takes up a soak slot.
Message on Acquisition
[ You realize you could mutate here. ] [ Type 'mutate firewalker' to develop the 'firewalker' mutation. ] [ (A cellular restructuring leaves your body resistant to fire, acid, and radiation damage.) ]
[ Your burning resistance increased by 5 - 8! ] [ Your acid resistance increased by 1 - 4! ] [ Your irradiation resistance increased by 1 - 4! ] Player pants as he/she/it starts to sweat profusely. As he/she/it wipes herself off, he/sheit suddenly looks very content. [ You've developed the 'firewalker' mutation! ] [ Your clone has been updated! All skills and experience saved. ]