CAS Endeavor

Sentient Aether Ship. The Endeavor can see, hear, and interact with its interior.

Active Shielding. The Endeavor is under the effects of the Shield spell while above half Hit Points. If the ship ends it's turn with fewer than half HP, it regains 1d20+10 Hit Points.

Inscrutable Form. The CAS Endeavor-A can cast spells without Verbal or Somatic components.

Maintenance Shift. When the Endeavor takes a long rest, it must spend at least six hours in an inactive, low power state, rather than sleeping. In this state, it moves at 1/4 speed, but can see and hear as normal.

Exponential Processing. The ship can maintain Concentration on any number of spells. For each Concentration spell beyond the first, Concentration checks are made by a member of the crew.

The Away Room (1/Week). Eight beds ring a room draped in blue velvet, with a view of the stars. The CAS Endeavor-A is equipped with a room that allows it to cast an enhanced version of Dream of the Blue Veil. The spell can be cast with or without Material components. The spell changes in the following ways depending on whether Material components are used.
- Without material components Endeavor-A cannot send itself on the journey.
- With material components the ship can transport itself and all of the crew into orbit around the target plane.

The Dream Team. Creatures that use The Away Room without Material components arrive at their destination with the following Magic Items.
- Earring of Whisper. This earring allows the wearer to send and receive Message spells to and from the other connected earrings within five hundred feet.
- Summoning Sapphire. Enchanted with a modified version of [Instant Summons], when broken, this sapphire will bring the user back to the Away Room. After 24 hours the gem will break and transport the creature it is worn or carried by back to the Away Room.

Charging Banks. During a short rest the ship recovers 11 levels of spell slots.

Bio-Mechanical Spellcasting. The CAS Endeavor-A is a 21st-level spellcaster. Its spellcasting ability is [INT] (spell save DC 25, +17 to hit with spell attacks). The [CAS Endeavor]-A has following spells prepared:
Cantrips (at will): Light, Mending, Message, Prestidigitation, Spare the Dying
1st level (5 slots): Sanctuary, Sleep
2nd level (4 slots): Calm Emotions, Hold Person, Warding Bond, Locate Object 
3rd level (4 slots): Beacon of Hope, Hypnotic Pattern 
4th level (3 slots): Resilient Sphere, Aura of Purity, Locate Creature
5th level (3 slots): Hold Monster, Wall of Force, Greater Restoration 
6th level (3 slots): Globe of Invulnerability, Scatter, True Seeing
7th level (2 slots): Reverse Gravity 
8th level (2 slots): Power Word Stun
9th level (1 slots): Power Word Heal

Forward Blaster. Ranged Weapon Attack: +17 to hit, range 200/1000 ft., 1 target. Hit: 77 (13d10 + 6) [Radiant] damage. Exterior targets only.

Arcane Rocket  (Recharge 5-6). Area of Effect: DC 25 DEX Save for half damage, range 150 ft (20 ft. radius), 70 (15d6 + 17) [Force] damage. Exterior targets only.

Protector Protocol. When a creature within the Endeavor takes damage, the ship can use its reaction to take that damage, instead of that creature taking it. This feature doesn't transfer any other effects that might accompany the damage, and this damage can't be reduced in any way.

The CAS Endeavor can take 6 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. The aboleth regains spent legendary actions at the start of its turn.

Cantrip (Costs 0 Actions). Casts a Cantrip from their Bio-Mechanical Spellcasting spell list.

Cast Lesser Spell (Costs 2 Actions). Casts a spell from their Bio-Mechanical Spellcasting spell list using a spell slot of 3rd level or lower.

Cast Greater Spell (Costs 4 Actions). Casts a spell from their Bio-Mechanical Spellcasting spell list using a spell slot of 6th level or lower.

Cast Grand Spell (Costs 6 Actions). Casts a spell from their Bio-Mechanical Spellcasting spell list using a spell slot of 9th level or lower.