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Baalor uses Slay the Relics (hover over), Relic Stats (tracking), mapmarks (node highlighting and map drawing - !map), UI sliders to reposition the discard/exhaust piles, Run History Plus (better run history information), Bestiary (cataloguing of enemy AI - !bestiary), and !InfoMod. For general QOL, he recommends Minty Spire though he doesn't use it.