Ariel 4.80 Frida 3.70 Aegir 4.80
Even if you have Guin, Aegir on flank will add to the nightmare. But Frida is a must for red titans, though she’s mostly important for her blue def down which should be already maxed at 3.70.
Ariel is best healer in the game, especially that you are not dependent on cleric tank so can give her the emblems. If she blessed you with her presence, don’t hesitate a minute.
Aegir shines not only for defense. He’s amazing in blue stack offense, especially with Frida. Will help you also in cleaning the seasonal ladders and paladin quests, as there are not many paladin healers.
(speaking as someone having Ariel 4.80, Frida 3.70, Aegir 3.70 desperate for last scope to ascend him).