Topic on Talk:Holy Seal
oh and IDK if this is common knowledge, but the units who can use "lure" are the mostly ones who can produce Aphrodisiac. Succubus/Plant, Succubus/Succubus, Succubus/Lizard, Sylvie, and Swamp Seals produce aphrodisiac. Avy produces aphrodisiac, but apparently cannot lure. Flora can lure, despite not producing aphrodisiac (despite being a Succubus/Plant). You don't need rain to find them with lure. Laquas are (AFAIK) normally unobtainable without the Tamer/Elementalist professions (and possibly ZooKeeper, by chance?), which are unfortunately incompatible with PoralShaper. Laquas can be found in the seal heaven portal though.
FYI, I don't think you can GET normal ice portals with harsh difficulty. There are floating island tundra portals, but in my experience they're 30% tundra tiles to 70% grass.