Official source summary; unverified details marked 待确认
01
The confirmed Void Flame requirement
Void Flame is introduced with the 1.0 release. It unlocks after clearing Void Depths on Normal difficulty or higher. Clearing on Casual is not the condition listed for this flame. The announcement excerpt does not provide its complete ability values, so those remain 待确认.
Thinking With Portals is a separate achievement involving Void Flame. It requires clearing Chaos Realm on Heroic with that flame. This is an achievement condition after choosing the flame, not the prerequisite for unlocking it. Confusing the two requirements would send a player toward a different goal.
02
Why older flame lists can be misleading
An earlier official rework explains that flames originally offered additional difficulty. The developer then aimed to remove most negative effects so players could choose based on levels and preferred effects. That change means an old “hardest flame” description may reflect a previous design. It does not establish a current best-flame ranking.
The same historical notes rename Demon Flame to Soul Flame without changing its abilities at that time. They list Soul Flame as unlocking after Frost Ruins. Frost Flame and Candle Flame are listed as removed in that rework. Those records explain old names; all current values and the complete 1.0 roster remain 待确认 where the supplied material is incomplete.
03
Historical Sacred, Arkflare and Ancient changes
The earlier rework says Sacred Flame prioritizes clearing corrupted tiles in range. Its range increases by two tiles per round up to twenty additional tiles in that announcement. Arkflare Flame is described as a lightning-themed flame unlocked after Bone Desert. These are historical descriptions, not newly measured 1.0 tooltips.
Ancient Flame’s corrupted-seal removal becomes free of coin cost in the same notes. Its per-round buff is reduced from +25% critical chance and +10% attack speed to +15% and +10%. The amount and area of corrupted tiles it generates are also reduced. Whether any later patch modifies these exact values is 待确认 in the collected evidence.
04
Separate preference from a tested recommendation
The official rework supports choosing flames for their effects rather than assuming each is an escalating difficulty tier. It does not compare every flame across every region and character. No fastest clear, highest damage or safest beginner ranking was recorded in the research. Those conclusions remain 待确认 rather than being inferred from a name.
For 1.0 unlock planning, the strongest evidence on this page is the explicit Void Depths difficulty requirement. For an old guide, the rename and removal records explain why a flame may be missing from its expected list. A full comparison still needs current tooltips and version-matched runs. This page does not substitute an invented tier list for that missing work.
Questions
What players ask
Does clearing Void Depths on Casual unlock Void Flame?
The official 1.0 requirement is Normal or higher. Any-difficulty completion applies to restoring Special Event Characters and Infernal Shards, not to Void Flame.