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The "Allies' aura buffs do not affect you" mod mistakenly also ignores the buff coming from a placed down Sigil.
On the other hand, the mechanically similar skill Frost Shield works with Ichimonji and its buff effect is increased by the sword's "10% increased effect of buffs on you" corerctly.
Would be awesome if the buff effect increase was also applied the same way from Sigil and wasn't left out from the fix.
Thanks in advance,
<3
Thanks for you report, I'll pass this on.