Fire in nature will burn down everything in its path. In nature, there are no firefighters or anyone to contain the fire, so the fire will burn and burn until it has no fuel left to consume.
What is the worst thing that could burn in this fire? Your nendoroid (ねん) collection. You've spent a lot of time and money collecting all these cool and rare and unique nendoroids and now they've all burned in the fire.
Currently there are no similar looking kanji which exist in the WaniKani learning system