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|This article is about the character. For the chapter, see Alternate History: Final Chapter.|
As the story progresses, it becomes apparent that Heiss knows more about the White Chronicle than he lets on.
Heiss is fought as a boss several times throughout Radiant Historia.
Stocke fights this battle alone, making it similar to Vlad the Spy. Heiss will use the powerful Blood Pain to deal around 70 damage to Stocke and restore his own HP; when he is not casting Blood Pain he will attack twice per turn. To lessen damage, have Stocke use Push Assault to move Heiss to the back row, then chain together turns to Stocke can cast Fire several times in a row to deal major damage to Heiss, without Heiss casting Blood Pain between attacks. The Mana Burst Turn Break can also prove helpful. Heiss flees when his HP is critical. Heiss has roughly .
This may be one of the hardest battles in the game. Heiss regularly uses MP Break to lower characters' MP, along with double-hit 100-damage attacks, and the Shadows regularly use 175-damage attacks. Altogether, the three of them can hit for 500 damage, which can be lethal to a level 40 party. The Shadows have roughly , so having Aht create Star Traps in the front row and then pulling them into it can wipe them out, as will Will-O-Wisp and similar "cross" spells.
Without the Shadows, Heiss is greatly weakened, and can be eliminated without much effort.