An idea I saw recently, and tried out, is a chanter-tank. So max out PER and RES, tertiary INT and don't tank CON. Works pretty good (the Moon-Godlike heal has good synergy) because the chants go well with front lining.
The spell-effects won't be maxed out since you're not focusing on MIG and INT but if you focus on CC, buff/debuff and summons, you can get good spell results as well as a good tank.
Chanters are well-known amongst Beta Backers to make excellent tanks. Sounds weird, but they're great.
That is really surprising. Can you elaborate on how their mechanics work for tanking? I'd like to try it.