Fully Bloomed Distrust, Largo

• This is a Malefic Boss in phase 1 of Delezie Raid.

Stab of Despair

• If you're hit with Largo attack, you get a stabbing mark. Getting too many will instantly kill you. 
• Before this kill happens, you will see a cast bar above your character. If another player bump into you, they can sacrifice 50% of your HP to rescue you.
• Note: One of his pattern is he create wings with eyes on them. Make sure you face away from Largo.

Counter Attack Pattern

• During the fight, Largo will have purple area under him. You can counter him during this time to cancel his attack.
• If you see "X" mark above you, this is the time to smash that button repeatedly.

Decisive Battle

• This is the pattern where you need to counter Largo three time with the "X" smashing button. Largo will do lots of screen cutting and slashes pattern around the map.
• If a clone is summoned and do some wave attack, simply jump to dodge those.

References

Namu.wiki

YouTube - 던파Sanso

YouTube - 히카리타마