I've explored a large part of the House of Ulm Zakir, but on the 3rd basement level some nasty new enemies started to appear (Lamias, Succubi, Inkubi, Chimera) in the anti-magic zones. Without magic support I decided to leave for now with my underleveled party (only Valkyrie is level 22 and Alchemist 24, the Brawler is 12, Ninja 13, Summoner 11, Bishop like 15-16) and explore elsewhere.
Beaten Rosslie Ruins and proceeded to clear the Afun Zar Light caves. Was easy enough, finally a mostly straightforward area (but still with a little of verticality with certain areas only accessible from certain ladders). Till I reached the bottom, 4th level. Here the shit got real with hordes of Holy Breath spamming Wyverns Elementals and groups of Fireflies (again, Holy Breath spamming + Lightning spells + servant full heals). Often Bicorns in the mix, with a high behead chance. And those annoying Manhunters, who all act before my characters and are pretty dangerous in large groups, especially for my back row.
Bicorns have group attack and could make for some nasty Brawlers with 20% Behead and 44 HP Turn recovery plus some decent resistances. But according to the Japanese Wiki, they are reborn as Warrior... that's too bad. Can't test myself yet, Summoner is still over 10 levels less then the enemy, but even later, the chances to capture a 80% Summon resist monster are not that great. Well, maybe when he's 10 levels HIGHER then the monster (1 in 25... unless I get very lucky with a Clean Hit).