(R18) SEQUEL colony | 4 hardest bosses (In my opinion)

Overfarming in nutshell...

Here are some notes:
Common
All bosses here are immune to all common aliments except stun.

Maria
Despite all of them are magical attack, it doesn't have elements. Hence elemental resistance are useless.
Despite being a vampire, she doesn't fear light. In addition to that, she got 50% magic evasion, therefore don't use magic.
Try to finish the battle within 13 turns, otherwise it will get extremely difficult.

Olivia
Halves incoming ice damage.
Every 6th turn after first turn, ATK/DEF/MDF buff with crit immune. You cannot act before this unless you have 8k AGI or above.
Various charm attack... (Why can't we use charm... We literally have a SUCCUBUS in the team!)

Saxa
Immune to fire and dark. Takes 25% extra damage to water and light elements.
20% resistance to stun.
Instant death attack at 3, 8, 15 and 27th turn
Forgetful attack at 6, 14, 21 and 26th turn
Be aware with ally with the state that has hammer with totally black background, if that person getting hit by the attack that occurs in every 6th turn after 5th turn, or turn 12 and 24, it will deal overkill amount of damage. Getting hit by it will also cause that person to get that state.
At turn 18 and 30, removes all stat buffs from ally, while cleanse all stat debuff on self.
After 31 turn, she will destroy every ally one by one, this cannot be resisted.

Digitalavisse
90% resist to water and dark. Takes 40% extra damage to light and thunder elements.
20% resistance to stun.
When it's active, cause the all ally to take 10% damage per turn. And it randomly select a special debuff between ATK, MAT, more SP cost and seal item usage.
Every second turn, extremely strong dark magic. Pointing this out, IT'S STRONG, building resistance beforehand to avoid one-shot.
Dark attack that cause poison, fatigue and confusion to 2 targets.
Water attack that cause stun. When HP below 50%, it will follow up with the attack above.
Every 7th turn, it will use an surge based attack that will cause a special state: Malware. This attack targets everyone and it's unavoidable. (that means PDR and MDR is useless)
When malware debuff didn't cleanse before it's gone by itself. That person who was with that debuff will be unable to act for the rest of the battle. Just like Saxa's turn 31+ move.
At 15th turn or 27th turn and after. The boss will try to escape from battle.

Timestamp:
00:00 - Equipment
00:31 - Maria, Queen of Blood
01:34 - Virtual Enemy Knight (Olivia Oldein)
03:34 - Evil God Mode Saxa
06:27 - Digitalavisse
18:18 - Item showcase