 Among these were the "Arduin Grimoire", the "Manual of Aurenia," and variants such as "Warlock" and "Tunnels & Trolls".TSR regarded these very warily, and in cases where they felt their trademarks were being misused, they issued cease-and-desist letters.More often than not, this legal posturing resulted in only slight changes to competitors' works, but caused significant animosity in the community.