What to do if your EPI and GSSG are exhausted? - Fighting boss Robin King (KOM) - Injustice 2 Mobile

EPI, GSSG and Raven is my usual build to one shot this final boss. But I arrived here with my EPI and GSSG used on a crit and lethal immune sub boss. What options do I have now???
Pip 1: Zatanna, JC & RKBA
Primarily for percentage damage. JC shows some promise as a good damage dealer, just that I don't think I have played him right.
Pip 2: Raiden, Raven and Shazam
Instead of GL, I put in Shazam for his healing, in case if my Raiden's life drops too much. This is a good potential build to one shot the boss.
I would try Pip 2 as the first pip in future.
I am a FREE TO PLAY player, so I generally work with whatever that is given free.

[@scottliu6042]

bro，BWTD can easily one shot him too

[@jylow7]

@scottliu6042 yea, but used earlier. 😂😂 I find God Killer to be very useful here. By stealing his attack, u also give ur guys alot more durability...

[@scottliu6042]

@@jylow7 yes that’s true