Question about UDMG modifiers

[illzbee]

Is UDMG the damage done to you and/or the damage you deal? for instance does UDMGBREATH +100 lower your defense to breath 10%?
I see as in equipment mods

-- Judges Ring
INSERT INTO item_mods VALUES (13505,1,20); -- DEF: 20
INSERT INTO item_mods VALUES (13505,387,-10000); -- UDMGPHYS: -10000
INSERT INTO item_mods VALUES (13505,388,-10000); -- UDMGBREATH: -10000
INSERT INTO item_mods VALUES (13505,389,-10000); -- UDMGMAGIC: -10000
INSERT INTO item_mods VALUES (13505,390,-10000); -- UDMGRANGE: -10000

so this makes you invincible?
Which makes me assume it is damage dealt to you.

[TeoTwawki]

U means Uncapped - not subject to the normal damage taken limitations. Other than that they work identically to the other damage taken modifiers and correct values can be inferred looking at other things using them.