I tested the cape to see if it had an effect on Cure spells.
90RDM/45WHM +27% Cure potency. 82+24 MND (this changes to +20 MND when I substitute Twilight Cape in for Prism Cape). Healing Magic skill +10 (skill is uncapped at 301, which includes the aforementioned +10).
Cure IV without Twilight Cape: 505 ---- Cure IV with Twilight Cape 504
Cure IV without Twilight Cape, Lightsday bonus applied: 555 ---- Cure IV with Twilight Cape, Lightsday bonus applied: 554
I have not been able to test the cape in light weather yet. From what I have seen, I do not believe this cape affects the potency of Cure spells. Can anyone verify that the cape does, in fact, affect the potency of Cure spells, as is stated on the main page of this item as of the date of this post? --Bapidai 02:06, February 14, 2011 (UTC)
The cape straight up says elemental magic - cure magic is healing magic and therefore should not gain a bonus from this. --Jericho 01:08, February 22, 2011 (UTC)