Related to Game Development: Breath of Air and level caps removal.
http://www.havenandhearth.com/forum/viewtopic.php?f=39&t=50429&sid=67443a0e304d2a611f8c0f96f7dc1cfa#p665863
Implement Invulnerability skill, when you learn you will forgot:
Theft, Murder, Rage, Vandalism, Siegecraft
Can teach only if you don't have active crime buffs on you at the moment.
Other players can not attack you. You can't use siege mechanic. Probably your shield can't receive any damage.
P.S: Edited. Forgot Siegecraft