Another other other raid boss

Red Mirage
1200 HP, 139 Atk, 17 Def, 28 Spe

Passive Abilities:
Immunity: Immune to Damage over Time.
Dual Attack: Attacks twice per turn.
Slow Field: This monster can only get double-attacked if the attacker's speed is three times that of this monster. This monster can only get triple-attacked if the attacker's speed is 4 times that of this monster.
Not Evil after All: This monster takes 1 damage from the damage-dealing skills of Priests, besides their Basic Attack.
Immortal: Immune to OHKO moves [Exorcise and Assassinate]. If they were to OHKO, they would deal 1 damage.
Excess Supplies: Immune to the effects of Sabotage. Then again, you really shouldn't. Look at its basic attack rewriting thing.
Basic Attack Rewrite: If this monster were forced to use its Basic Attack by some arcane method, it will use Acala Sword instead.

Active Abilities:
1-15: Acala Sword (Attacks 1 player. Roll 3 dice with the current attack stat as the number of sides then divide the result by 6. This is TRUE DAMAGE.)
16-25: Shattered Slash (Attacks 1 player. This attack automatically hits twice. This attack has a 50% chance of hitting 3 times, a 25% chance of hitting 4 times, etc. Roll the number of hits times 3 dice with the current attack stat as the number of sides, and divide the result by 6. This is not true damage.)
26-35: Power Crash (Attacks 1 player, and all players around it [so rolling a 2 results in 1 and 3 being attacked]. Roll 3 dice with the current attack stat as the number of sides then divide the result by 6. This is not true damage. The targets' defense is reset to 15 for 3 turns, regardless of this attack connecting or not. If these targets were to be hit by Acala Sword during the time their defense is set to 15, the damage of said move is doubled.)
36-40: Flaming Wave (Attacks all players. All targets take 10% burn damage. Then, roll a 5-sided die and multiply the result by 3. This is true damage.)