1. Executrix has the worst basic of original three(HO, Exec, Endu)
HO: random assist: guaranteed damage from both HO and assisting ship
Endu: Target Lock: TL itself is key feature in fleet battle. many abilities can attack every ship with TL, including Endu's AOE
Exec: Expose: some other ship should attack Exposed ship or it does nothing
I use Executrix as my Capital Ship, and I often wished Exec applied TL instead of Expose
2. Executrix is only about offence
Among 4 Capital Ships available(original three & Chim), Executrix is the only one without any defensive ability.
HO: health/protection recovery on target ally
Endu: taunt, crit immunity, and protection recovery on target ally
Chim: health recovery on all ally and foresight/defence-up on support/tank ally
Exec: every skill is about applying more damage or applying debuff accept AOE which gives TM to all ally.
without tank or support or heal, your glass cannons will be wrecked real soon.
Executrix is an amazing capital ship, my rank went up since I switched from HO to Exec. but you should be aware of those drawbacks.