Earlier this month, we released an updated version of our adventure Deadly Delves: Along Came a Spider for the Fifth Edition of D&D. Inside are a number of new monsters and spiders do take up the majority of those new monsters. However, they are not the only new monsters inside. Today we want to show off the mite. These little fey are used to being kicked around. They get absolutely no respect and carry a grudge because of it. Despite their evil bent, they are not without their redeeming qualities. Find out what they are by reading this adventure today.
Download Deadly Delves: Along Came a Spider today at the JBE Shop, DriveThruRPG, Paizo, and the Open Gaming Store.
Mite
Armor Class 12
Hit Points 40 (9d6 + 9)
Speed 20 ft., climb 20 ft.
Str 6 (–2) Dex 14 (+2) Con 13 (+1)
Int 8 (−1) Wis 13 (+1) Cha 10 (+0)
Skills Perception +3, Stealth +4
Senses darkvision 60 ft., passive Perception 13
Languages Deep Speech
Challenge 1/4 (50 XP)
Innate Spellcasting. The mite’s spellcasting ability is Charisma (spell save DC 10). The mite can innately cast the following spells, requiring only verbal components:
At will: prestidigitation
1/day: bane
Actions
Dagger. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) piercing damage.
Dart. Ranged Weapon Attack: +4 to hit, range 20 ft./ 60 ft., one target. Hit: 4 (1d4 + 2) piercing damage.
Vermin Empathy (1/day). As an action, a mite can conjure a swarm of bats, a swarm of rats, a giant centipede, 2 giant rats, or a giant wolf spider. The conjured creatures attack the closest creature except the mite. The mite has no additional control over the conjured creatures.
Jon Brazer Enterprises 
I was looking for a conversion for 5e for kingmaker, no way is this balanced tho. Jesus 40 hp!? Even if it was 4 hp it summons one or two 1/4 cr creatures just cuz how could itself be 1/4 cr
I ask myself that alot frankly. It seems crazy, but the entry straight out of the DMG says a CR 1/4 creature should have: Proficiency +2, AC 13, hp 36-49, Attack Bonus +3, Damage/Round 4-5, Save 13. The mite has Proficiency +2, AC 12, hp 40, Attack Bonus +4, Damage/Round 4, Save 10. So while the attack bonus is 1 higher, everything else is at or below what is expected for its level. Plus the summon monster ability is not like 3e where the players do not get XP for summoned creatures. In 5e they do. This means that the GM can build a “surprise it is more difficult than you originally thought” encounter around this creature, while wasting an action on the part of the mite.
Compare that with the Dretch demon from the MM which has Proficiency +2, AC 11, hp 18 (plus multiple resistances and immunities so its hp is 36, Attack Bonus +2, Damage/Round 8, Save 11 plus it has a Fetid Cloud ability which poisons PCs that fail the save. Both hp’s are within the expected range for the monster of this difficulty, but the Dretch demon is more of a pain since it has resistance to common cantrip and 1st level spells. Add in the fact that its damage/round is nearly double what is expected while the mite is right in expected.
The real problem is that many of the monsters in the books produced by WotC are below what is expected per level. Translation: their monsters are easier than what they say a monster should be per level.