You should be able to invis then invis vs undead when you hit undead mobs if you come down the path with the spiders. I'm really glad you are enjoying kaesora, it's one of my favorite zones and it doesn't get enough traffic. The xp in the hole is really good at your level. The mage can do well with elemental DD line, loam drops off of any elemental mob, xp is good, and there are some good PP drops. I'm not sure on the level but the mage can summon some weapons that proc a elemental DD which would be great for your charm pet and mage pet.