Thank you so much! My aim was to emulate occult-character archetypes from the Cthulhu Mythos, so Pathfinder's Hastur cleric is in line, yes! In the Cthulhu Mythos lore, The Elder Sign can be seen as the reverse Yellow Sign, which affects the Eldritch Horrors and other otherworldly creatures. And glad you like the Alien Seer! I've been in a Weird Fiction science fantasy mood, so I'm glad you like it!