Krivis C3 brings more damage, more utility and a high duration TP[75-80 seconds, depending on Divine Might or not], so that build is more than viable.
Heal can be easily compensated by using potions and getting some CON, Safety Zone isn’t really required since you got no Dievdirbys that requires the protection while carving his statues or Kabbalist to cast Merkabah.
On top of this, you also get Aukuras to reduce natural HP regeneration time and increase your chance to dodge physical attacks, Divine Stigma to boost STR and INT of you and your party members by a lot and Daino to increase the buff count.
This build goes incredibly well with a Chrono3Thauma3 that will appear at Rank 9 and any magic damage dealer, promoting full magic parties.
Zaibas 15 is a force yet to be acknowledged, it deals a lot of possible damage since it benefits from Transmit Prana a lot (19-20 hits= 38-40 hits of additional damage from TP) and has doubled damage during Storm Calling. It also was buffed to have faster damage ticking(0,15 secs/lightning), a boosted AoE capability (7 targets per lightning) and reduced CD time (20 seconds), so it’s a really good damage skill in combination with Sadhu and Taoist.
This is wrong. Your Krivis C3 brings great damage and great support. Divine Stigma is a buff that nearly noone has but that brings tons of extra matk and possible boost potential for your Thauma in party(we’re talking about 95-103 additional INT/STR, that’s about 230-250 more matk/patk and about 203 matk/patk for Swell Left Arm and 143 matk/patk for Swell Right Arm).
I.e. a boost of ~500-600 matk/patk in total, which is equal to 2-3 transcendence stages on your level 315 unique weapon (e.g. Skull Smasher)
Meanwhile, having another Cleric C2/C3 in the party will lessen the need for Heal,Safety Zone and Divine Might(e.g. C3>Pala3>Kabba3, full tank build to take the damage for the whole party).
Zaibas + Storm Calling brings great damage which is superior to your Possession and Astral Body Explosion [6200% Zaibas vs. 4700% Possession vs. ~3200% ABE; all numbers without attributes or TP]. The best thing is that you can more than double the boost time of Chapparition card effect with Melstis, meaning you can have up to 14 seconds of 30% additional matk every ~90 seconds (if you use the pot after TP and Melstis afterwards) solo or more often if you got that ThaumaChrono at hand for Pass.