naming unknown effect

[ever_boy_]

I got a halloween hat which has a hidden bonus, increasing atk power when it activates (the visual effect is identical to berserk potion's).
whenever it happens, the console shows:
You use effect: unknown #220

I thought of adding its corresponding hexa number to status_id_handle, but it already exists (0xdc EFST_REINCARNATION).
what should I do to name this unknown effect:

[hakore]

Visual Effect is not the same as status effect.

See packet 01F3 (misc_effect).

Also, see effects.txt (which seem to currently exist only in twRO table subfolder).