This is just a preview as I'll be out most of the evening and won't have time to read through the AI until tomorrow. Even then the full analysis will take a good amount of time as phase 2 and 3 are handled by the same AI block using an angel idol to separate them instead of having a third phase in data. Plus Karna Masta has around 100 scripts (including the dupe scripts needed for BB counting, but still a lot more than average fights)

Phase 1

8,000 ATK
5,555 DEF
5,000,000 HP

Spark resistance:

• Base spark damage reduced to 25%
• Buffs reduced by 80% (multiplicative, 50% -> 10% etc)

Crit resistance:

• Base crit chance reduced to 7.5%
• Crit chance buffs reduced by 90% (multiplicative, 60% -> 6%)
• Crit damage bonuses are negated, but the base 50% crit damage is untouched
  • = 60% crit buff increases damage output by approx 2.5%

EWD resistance:

• Immune to EWD bonuses
• No resistance to base elements ( 50% damage from having Dark element)

BC resistance:

• Base drop rate reduced to 24.5%
• Value of buffs is halved (e.g. 35% -> 17.5%)

HC resistance:

• Base drop rate reduced to 7%
• Value of buffs is halved (e.g. 35% -> 17.5%)

Phase 2 and 3

11,000 ATK
6,666 DEF
12,500,000 HP

Mostly as above. BC resistance and HC resistance change to the following:

• Base BC drop rate reduced to 17.5%
• Base HC drop rate reduced to 5%
• Buffs to either are reduced by 75% (multiplicative, 35% -> 8.75%)

Phase 3 uses the same stats as phase 2, although due to the mechanics Karna Masta's HP doesn't matter as much.