How to make this a fun djinn fight for relatively new players? (Bryan: Stay out, I know you're out there)

I'm working on a new boss fight for a 5-person level 8 party of fairly new people. I wanted to give them something completely different, so I figured a fight on a small 20x20 circular rooftop with a stealthy djinn might be fun. I'd love to hear thoughts on how to make this a good time. My main idea is to force the party to figure out creative ways to find the djinn, since they don't have any way to see invisible creatures in their normal set of abilities. Things like throwing sand in the air, or holding ropes between each other to detect the silent wind motion as he moves around. Stuff that is more flavorful than a normal straight fight.

I'll also be throwing players off the roof, forcing them to make agility saves to grab hold of ropes that are on the edge of the building, then strength checks to pull themselves back up. Have some moderate injuries occur if they roll badly. What suggestions would you have for me to make this a fun fight?

Izel, Guardian Djinn

Large Elemental (Air), Lawful Neutral

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• Armor Class 17 (natural armor)
• Hit Points 152 (16d10 + 64)
• Speed 30 ft., fly 60 ft.

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STR	DEX	CON	INT	WIS	CHA
18 (+4)	22 (+6)	18 (+4)	16 (+3)	20 (+5)	18 (+4)

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• Saving Throws Dex +10, Con +8, Wis +9, Cha +8
• Skills Insight +9, Perception +9, Stealth +10
• Damage Resistances lightning, thunder; bludgeoning, piercing, and slashing from nonmagical attacks
• Condition Immunities charmed, exhaustion
• Senses truesight 60 ft., passive Perception 19
• Languages Auran, Common
• Challenge 12 (8,400 XP)

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Elemental Demise. If the djinni dies, its body disintegrates into a warm breeze, leaving behind only equipment the djinni was wearing or carrying.

Innate Spellcasting. The djinni's innate spellcasting ability is Charisma (spell save DC 16, +8 to hit with spell attacks). It can innately cast the following spells, requiring no material components:



At will:

Mage Armor: You touch a willing creature who isn’t wearing armor, and a protective magical force surrounds it until the spell ends. The target’s base AC becomes 13 + its Dexterity modifier. The spell ends if the target dons armor or if you dismiss the spell as an action.

Greater Invisibility: (Concentration) You or a creature you touch becomes invisible until the spell ends. Anything the target is wearing or carrying is invisible as long as it is on the target’s person. The target can attack or cast spells without becoming visible.

3/day each:
> Wind Wall: Requires concentration. You create a wall of strong wind on the ground at a point you can see within range. The wall is up to 50 feet long, 15 feet high, and 1 foot thick, or a ringed wall up to 20 feet in diameter, 15 feet high, and 1 foot thick. It lasts for the duration, blocking arrows, smaller creatures, gases, and fog.
> Lightning Bolt: You release a bolt of lightning that arcs toward a target you can see within range. A line of electricity 100 feet long and 5 feet wide blasts out from you in a direction you choose. Each creature in the line must make a Dexterity saving throw, taking 8d6 lightning damage on a failed save, or half as much damage on a successful one.

Actions

Multiattack. The djinni makes two scimitar attacks.

Wind Blade. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 15 (2d8 + 6) slashing damage plus 5 (1d10) lightning damage.

Windforce Blade (Enhanced Multiattack). If Izel hits a target with both attacks during his Multiattack, the target is pushed 10 feet away from him.

Whirlwind (1/Day). As an action, Izel transforms into a whirlwind for one turn, moving in a straight line up to 60 feet. Any creature in the path of the whirlwind must make a DC 16 Dexterity saving throw. On a failed save, the creature takes 18 (3d12) bludgeoning damage and is thrown 15 feet in a random direction and knocked prone. On a successful save, the creature takes half damage and is not thrown or knocked prone.

Legendary Actions

Izel can take legendary actions, choosing from the options below.

Wind Push. After every enemy's turn, Izel rolls a D20; on a 13 or higher, he uses the wind to move one enemy within 60 feet of him. The target must succeed on a DC 16 Strength saving throw or be pushed 15 feet in any direction Izel chooses and knocked prone.

Wind Buffet. Izel creates a small burst of intense wind around himself. Each creature within 10 feet of Izel must succeed on a DC 16 Dexterity saving throw or take 17 (3d10) bludgeoning damage and be pushed 10 feet away from him. Using Wind Buffet breaks Izel’s concentration and ends his turn.

Lair Actions

• At the start of each turn, roll a D20. On a 10 or higher, all creatures on the battlefield are pushed 5 feet in a random direction determined by a d8 roll. This unpredictable movement simulates the chaotic nature of the winds that Izel commands.