The Phantasma cited on this legendary is 幻灭心能 you loot this currency in Torghast Tower.
When you loot 幻灭心能 from killed enemies will have a low chance to summon Phantasma Demon, if you kill this guy you'll receive the buff 幻灭心能恶魔精华 (1 min duration).

幻灭心能恶魔精华 Increases Phantasma earned by 10% per 1 min.
So, 25% + 10% = 35% Increases Phantasma earned.

Item demo: https://youtu.be/pzmwwGMdOek

The recipe for this legendary drops from:

Torghast, Tower of the Damned, Layer 6+

Just got this from Coldheart Interstitia level 6. I imagine this drops from the first level 6 you complete.

小知识

屏幕截图

视频

稳定的幻心诱饵的回忆

物品等级：1
拾取后绑定
唯一

符文铭刻之力

Approximately 4 procs per minute

获得的幻灭心能增加25%。从敌人身上拾取幻灭心能时有几率召唤一只幻灭心能恶魔。这只恶魔会向随机方向奔跑，将其消灭可以使整支队伍获得的幻灭心能提高10%，持续1 min。

指南