undead are good summoners with the play dead skill. you can summon incarnate and update him(it?) then just play dead to avoid enemy fire or do it id you have a feeling you may die before your next turn. they also may be a good support too by aiding others, play dead when enemy focused their fire on you and break the status if you think your companions needs immediate aid. if you are injured(, not on fire and not decaying) you may play dead on a poison puddle to heal yourself while playing dead. undead are also good wizards if you take elemental affinity and stay on a poison puddle so you get the 1 ap reduce without any negative effects. when your geomancy spells are all in cd you may light it up and continue the assault with pyromancy.