Asriel Dreemurr (Final Form)

God Of Hyper Death. After every 5 attacks, every player has to roll a constitution save. if the save's total is less than 9 then they will die instantly.

True Power. All stats and damage are multiplied by 2 in his Final Form

Fire Magic. Fire Magic Attack: +3 to hit, reach 30 ft., 1 target. Hit: 2 (1d20 + 5) Fire damage. 

Star Blazing. Star Blazing Attack: +10 to hit, range 60 ft., all targets. Hit: 2 (1d20 + 5) Force damage. this attack repeats three times in the same turn

Shocker Breaker. Shocker Breaker Attack: +7 to hit, range 70ft, 2 targets. Hit: 3(1d20 +2) Thunder damage this attack repeats five times in the same turn

Chaos Saber. Chaos Saber Attack: +4 to hit, range 10ft, 1 target. Hit: 4(1d20 + 3)  Slashing damage this attack repeats twice in the same turn

Chaos Buster: Chaos Buster Attack: +10 to hit, range 30ft, all targets/1 target. Hit: 2(1d20 +1)/ 3(1d20 +3) this attack will repeat three times attacking everyone then attack one person Force damage

Power Spike. Power Spike Attack: +10 to hit, range 100ft, 1 random target. Hit: 1*(2d20)
Force damage This attack will repeat 7 times targeting a random player each time

True Potential. Now that Asriel Dreemurr is using hit true power all attacks will miss unless their rolls are +18

Uncertainty Of a Troubled Child. If the players successfully convince Asriel Dreemurr to calm down or reduce his hp to 10% or less he'll use "Angel Of Death" and attack all players at once.

Reflectance. After using "Angel Of Death" he'll revert to his God Of Hyper Death Form.

No Turning Back. No one can try to escape the battle as they've been transported to another dimension by Asriel

Angel Of Death. Angel Of Death Attack: +5 to hit, range Infinite ft, all targets. Hit: 10*(5d20+10) All damage types
Every player must roll any type of save roll and get over 17. Succeding means you get left with 10hp, but failing to do so means they'll have to take all the damage from the attack. (only usable in Final Form)