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Need Help with Lvl 35 Summoner Class
This is the fight where I have to beat Titan-Egi. It is called "Austerities of Earth." I can get past the first phrase where I beat Titan. Not the Dark Summoner phrase though.

I am level 35 and my equipment is all in the 30s. I have tried every type of pet I have and so far Topaz Carbuncle seems the best. However, I do such low damage, the Dark Summoner's and his Ifrit-Egi health only went down 10% in 8 minutes of fighting. I am constantly having to heal the NPC healer. She heals my pet(barely) but never heals herself and stands in all the AOEs. I can get both enemies off of her, but she still is constantly dying. I also sometimes have to heal my pet because sustain is gone(which I think is really stupid and we need it back.) The whole time my Topaz was under half health and healer was constantly healing it.

Any tips?

I have tried many different things and failed at least 9 times.