Aramintha is very one of few very good mage, she has good AOE and single attack, PLUS she can give attack buff which you cannot get from any supporter now (forget about Elson). so with good team formation i will said she is damn good.

unless you really want Haste, or else i will said proceed. and get yourself a healer to make your life easy.

and forget about Ravi, don;t follow the tier list in internet, it is 50% not accurate i will say.

Sez is good too. but he is a selfish hero and i don't like hero who does not bring utilities into the team. hey but that is just me. =)

i do know few Sez can one shot people team though. Sez is good in PVP when there is other heroes before him can deal enemy team hp drop till  50% then the sez can use his ulti do instant wipe their whole team. Pve wise he is good when enemy hp below 50% so all his attack become AOE good for farming but provided you got attack buff =).

Aramintha is good because his burn debuff is insanely strong when u build her right end game. her burn debuff easily burn around 3-5k. so she is good in attacking and she provided burn effect and she give attack buff. She is damn useful and bring a lot of value into team compare to selfish Sez.

Try to look at below memebrs for your Aramintha Team.:-

Healer:- Achates & Angelica
DD- Lorina
Supporter - Dorris (Def buff and Continuous healing) - improve your overall team survival since Aramintha is kinda squish however she is ML chracter. Or Secondary choice will be Rin will do if you get her in future.

One thing you have to know about this game is Healer and Support can be a very good Tank because they are build with Speed/Hp so try put them in front for tanking so technically you no need Knight However knight artifact has some really cool effect but that is another topic for future. if you build your supporter and healer right they will easily have 14-15k hp with high speed.

you should be good with above team.

who has the highest AOE fire attack in Epic Seven? maybe can match with Hazel. Maybe Aramintha? one hit GG. even if they do not die in one turn the burn will kill them automatically when it is their turn to move since burn =50% of your attack.

put Hazel, Aramintha, then Sez ulti o.O since Hazel greater buff only can give one person.