This supplement is very useful if you use the Inked Adventures' Basic Pack (or the free Sample Pack) for playing official modules and adventures. Many of the dungeons found in those materials have some big towers, round chambers, or something similar to a throne hall. You need this free supplement badly if you want to recreate those dungeons with Inked Adventures (something I can only recommend to everyone). Luckily this is a freebie, so no rip-off here. I like this product very much and put it into effective use during a game playing D&D's The Sunless Citadel.