so he has a protective layer around his septic arm but he can also retract it so basically he can touch things with his arm without destroying anything, or produce heat in the veins of chemicals that can reach to extremely hot levels of heat with the protective layer over things without the layer he can overflow his veins, choosing to spill many different toxic acids, or keep in in his veins he can also shape his toxins to fit as a glove so basically anything that touches the toxins from its arm will rot/decay/die/etc if he