@Keirah
You could do the set up Trips is saying which is a Speed team.
Or you could continue going for a Tank team with a few changes.
Kael doesn't belong on a Tank team.
Kael is often used on Speed Nuking teams.
The set up I would do would be:
Leader: Valla - 45% Resist Aura
1st move: Hakkorn Smash Lord -------> Remove all Debuffs + Block Buffs + Heals
2nd move: Valla ------------------------> AOE Def Down
3rd move: Lightsworn -----------------> Single Target Nuke
4th move: Scyl of Drakes --------------> AOE Stun
I would put Hakkorn in a Shield set + Immortal set with Massive HP.
I would put Vall in a Cursed set + Accuracy set with Good ACC.
I would put Lightsworn in a Lifesteal set + Criitical Rate set with Good C.Rate.
I would put Scyl of Drakes in a Frost set + Immortal set with Massive Defense.
Try to push Hakkorn HP above 60k.
Try to push Valla, Lightsworn, & Scyl of Drakes DEF above 3.5k.