When Batman fights Rohtul upon his escape from prison, he finds himself weakened by the Quartz that are within the chest compartment of Rohtul's giant robots (exposing Rodon to Quartz creates the same weakening properties as Kryptonite).
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In "Batman R.I.P.", a past hallucination induced by Professor Milo's gas is revealed to have inspired Bruce Wayne to create the 'back-up' personality of the Batman of Zurr-Enn-Arrh, a more ruthless Batman personality designed to take over in the event of Bruce Wayne being psychologically attacked in such a manner as to render Batman out of action.