You are considered proficient with your unarmed strikes. When you make an unarmed strike, you use your tail instead of your fists (assuming you still have one), dealing 1d4+DEX modifier Damage. This tail can carry up to 30 pounds and has 10 HP and your armor class. When your tails health is reduced to 0, it falls off. When your tail falls off it regrows in 1d4 days. 

Assuming you still have your tail, when you see the full moon or an enormous amount of energy is released you WILL turn into a great ape. This form is controlled by the DM unless you make a Wisdom check with a DC of your Strength score, on a failed check your alignment turns chaotic evil and your character is controlled by the DM, on a successful check you control this form. When in great ape your size is gargantuan, you have a +2 to attack rolls, you can only make unarmed strikes, you don't lose any items, you gain 10 temporary HP, and unarmed strikes deal 1d12+STR modifier damage.                                                                                                                                                                                                                                      Breath blast You fire a 120 ft line ki blast form your mouth that deals 1d10 force damage per level(max level 15). Any creature hit by this blast must make a DC 8+proficiency bonus+STR modifier Dexterity save, on a failed save takes whatever damage you have at that time, or half that on a successful save.                                                                                             Superior grip As an action you can make a grab attack and grapple whoever you hit, and as a bonus action you can do a crush attack dealing 3d4 bludgeoning damage per level(max level 15). Breaking free of the grab attack requires successful DC 15 Strength (athletics) check                                                                                                                                                               PS: After you achieve Super Dassenan 3, roll a d20 when you go great ape.  if you roll a 20 you become golden slaad and automatically have control over your form. Your great slaad abilities do not change, but you do turn into a super Dassenan 4 after 1 minute. 

Your AC equals 11+DEX modifier+CON modifier

You have a base walking speed of 30 ft and a base flying speed of 40 ft

 At 5th level you can transform into this form 3 times per day as an action. You stay in this form until you dismiss it as a bonus action or you fall below a quarter health. This form gives +5 to walking speed, +10 to flying speed, +1 to attack rolls, and +2 to damage rolls.

at 5th level You can detect any living creature's life force in a 60 ft cube

if you dedicate 2 days to do nothing but train a form, the time limit no longer applies (If there is one) and you can use the form as many times per day. and will give an extra +2 to damage rolls in the mastered form.

at 7th level you can transform into this form 2 times per day as an action. This form lasts 1 hour, until you dismiss it as an action, or fall below a quarter health. This form gives +10 to walking speed, +20 to flying speed, +3 to attack rolls, and +5 to damage rolls.

at 9th level you can transform 1 time per day as 2 actions. This form lasts 30 minutes, until you dismiss it as an action, or fall below a quarter health. This form gives +20 to walking speed, +40 to flying speed, +4 to attack rolls, +7 to damage rolls and after every turn you gain an exaustion point.

you can transform once per day as an action. This form lasts 1 hour. This form gives +30 to walking speed, +50 to flying speed, +7 to attack rolls, and +15 to damage rolls.