Entryway is not claimed yet by anyone (pale added pair of towers with nice ballistas). Also you can create freestanding wall outside Soul Casket (and build garden inside said wall and make people go through garden to reach Soul Casket entrance).<br/><br/>Anyways on fleshy/undead walls; there is bone material for walls which can be used (stronghold builder guide has it). No stats for flesh/zombie walls but we could create something custom; it's most likely wondrous architecture anyways and most likely mimics features of Wall of Limbs (http://dnd.arkalseif.info/spells/spell-compendium--86/wall-of-limbs--4742/), using zombie hands ofc or Wall of Bones (http://dnd.arkalseif.info/spells/complete-arcane--55/wall-of-bones--482/index.html). With caveat that those wall effects are for people trying climb or be adjacent to the walls (and not be allies). The walls themselves being solid and not allowing get through.<br/><br/>Also note for Pale and on walls; Soul Casket (and thus all extra squares/spaces created individually by Archfiends) exist both material and ethereal plane. Albeit not specifically mention it; it means ethereal/incorporeal entities cannot get through the walls (as in incorporeal/ethereal state there is wall as well). It's not because of ward but more the fact that there is actual physical obstacle. Plus you can see them (albeit not able affect them physically unless your ethereal or incorporeal as well).