I can confirm this always occurs when possessing anything that brought you to the fearscape from quick debug mode tests.
[LOG] #PURPLE##UID
[ActorObjectUse] useObjectDisable: draft letter inven/slot 1 2 tid nil
[PROFILE] filtering save of uniques to profile online
[PROFILE] mounted online on /current-profile
[USERCHAT] channel serial data Metellus tome 707
[PROFILE] unmounted online from /current-profile
[PARTY] New member, add after player player
Loading tile from tileset /data/gfx/shockbolt/object/belt_hardened.png
[LOG] You feel a surge of power as a powerful creature falls nearby.
[PROFILE] filtering save of deaths to profile online
[PROFILE] mounted online on /current-profile
[PROFILE] unmounted online from /current-profile
[SOUND] loading from /data/sound/actions/death.ogg :=: sound "/data/sound/actions/death.ogg" : <static>
C Map size 21:10 :: 210
C Map seens texture: 83151 (75x60)
[LOG] #LIGHT_RED#You are brought back from the Fearscape!
Lua Error: /data/talents/corruptions/shadowflame.lua:309: attempt to index field 'level' (a nil value)
At [C]:-1 __index
At /data/talents/corruptions/shadowflame.lua:309
At /engine/Game.lua:322 onTickEndExecute
At /engine/Game.lua:313 tick
At /engine/GameEnergyBased.lua:60 tick
At /engine/GameTurnBased.lua:51 tick
At /mod/class/Game.lua:1386
---------------- Stack Dump ----------------
2: table // 4077db98
1: table // 4077db98
--------------- Stack Dump Finished ---------------
[LOG] #UID
Lua Error: /mod/class/Game.lua
At [C]:-1 __index
At /mod/class/Game.lua:1555 displayDelayedLogDamage
At /mod/class/Game.lua:1396
---------------- Stack Dump ----------------
2: table // 4077db98
1: table // 4077db98
--------------- Stack Dump Finished ---------------
[LOG] #UID
Lua Error: /mod/class/Game.lua
At [C]:-1 __index
At /mod/class/Game.lua:1555 displayDelayedLogDamage
At /mod/class/Game.lua:1396