Summoner getting ganged up on

[wereotter]

Titan Egi for soloing.
It used to be the tank pet, and it at least gives you defensive shields that help in the situation that you've described.
Use the shield often

Debatable. I find for myself tacking content as a summoner, it's still better to just do more damage with garuda than to get the shield from titan. At this point I don't even have the summon titan on my bar anymore since it's better to just kill the enemy faster than to get a shield (unless I'm trying to solo content intended for a party)