I made it to decius but cant defeat him any tips n how to defete him

1. what pets are in the party you're using for him?
2. have you successfully activated the seals?

Hugo, Rhea n Tony r my battle pets
I have not unlocked the seals but already he is wanting to fight

The seals don't unlock the fight, but rather affect how strong Desius is; more seals successfulyl activated = he's weakened more in the fight.

Okay, the pets... well. That, may be why you're having an issue.

1. All three pets are air element, which means there's no tank, healer, or buffer elements.
Air only has the non-elemental Block and Mend for defence and healing.

2. Tonowari Metakaniya has no proficiency points assigned at all

3. out of 12 equips, 7 are Intelligence-type (evoker/illusionist) and 2 are disciple. Air attackers, being a Physical element, run off of the Strength and Physical Damage stat for their move output, so the boosts to their int and magical damage stats aren't helping them much. Air attackers use Myrmidon while sub-60, to focus on their Strength and Dexterity stats.
Additionally, a lot of uncommon gear (which is uh. Bad. terrible stat boosts) and lower level gear.

Since the team is all over lv50, you generally want to be using lv50 legendary (or epic) gear. lv50 epic/legendary gear is some of the easiest to get since it drops from lv50 mission satchels, so there's typically a good stock in the trade broker for users who don't have pets running lv50 missions.



I'd suggest first considering if you want to alter the team element setup to include a Tank and/or a Healer/buffer.
Do you need more in-depth info on any of these?

which elements shall I assign tony n rhea?

The most typical team setup is a Tank in slot 1, a Light Healer, and an attacker
Tanks are typically Earth, Water, or Shadow, sometimes Light (Light tends to double-up as tank-healer on double-attacker teams)

Earth and Water tanks use Assassin gear sub-60, for Strength and Agility
Shadow and Light tanks use Illusionist at sub-60 for Intelligence and Agility

Light healers can go either way on Evoker or Illusionist, depending on if you want the dex or agi more. Dex tends to be the more common.

What you go with would depend on what feels most comfortable to you in terms of moveset