Spellcasting. The Arcane Sentinel is an 18th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 17, +9 to hit with spell attacks). The Arcane Sentinel has the following wizard spells prepared:
Cantrips (at will): fire bolt, light, mage hand, sword burst, thunderclap
1st level (4 slots): detect magic, identify, magic missile, shield
2nd level (3 slots): detect thoughts, mirror image, misty step
3rd level (3 slots): dispel magic, counterspell, fly, lightning bolt
4th level (3 slots): dimension door, greater invisibility, Raulothim's Psychic Lance
5th level (3 slots): destructive wave, steel wind strike
6th level (1 slot): chain lightning
7th level (1 slot): power word pain
8th level (1 slot): dark star
Fist. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) bludgeoning damage.
The Arcane Sentinel can take 1 legendary action, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature’s turn. The Arcane Sentinel regains spent legendary actions at the start of its turn.
Cantrip. The Arcane Sentinel casts a cantrip that has a casting time of one action.
When the Arcane Sentinel drops to 0 hit points, it explodes with a burst of arcane energy. All creatures within 20 feet of the sentinel must succeed a DC 20 Dexterity Saving throw or suffer 10 (3d6) points of Force damage.
Additionally, any remaining Sentinels that can sense the destruction of the Arcane Sentinel are rallied, and gain 50 temporary hit points and a +1 to their Proficiency Bonus.
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