The Manticore - 170 R7
Stats
Armor - 55053
Reality - 77517
Normal Crit - 196
Fantastic Crit - 195
Tenacity - 265
Most people used her in the DOT team as she can do insane damage at the start of the battle. Her mushu disc is also interesting, it deals a good amount of fantastic damage.
Her skills also do fantastic damage except white skill. So, yeah you are thinking right about the fantastic crit mod upgrade.
To crit, stat should be at 270, so she needs at least 270 - 195 = 75, interesting thing is at R8 with server level 175 you only need 275 - 211 = 64.
Seeing this stat at R7 you definitely need 3 BD mod with Fan Crit Upgrade. So, it will totally depend on how you are going to use her. Pair her up with Hades(meg), Manti will double the damage by also crit, that means she will do 4x damage. I would suggest to give 3 BD mod with Fan Crit ( 24 + 24 + 24 )
BD Mod will increase Basic Damage & her white skill damage is Orange so it will increase that white damage also.
PB confirmed that DOT also Crit
Now, let’s talk about survivability, her armor is good & if the red skill is maxed she will get additional armor +79147, so you need to work on reality stat.
The Fourth Mod should be HP mod with Reality Upgrade so that she can survive the battle. If she seems squishy pair her with Meg or some other toon who can help her being alive.
For those who don’t have resources, I will give another mod matrix below
Mod Matrix
The Manticore
The Manticore - Another version increase damage by skill
Blue will increase DOT damage, pair her up with hades (meg) for double damage at 5 star