Cleon
Legend
Okay, on to the Stat feedback for the Flyweight, Medium and Giant!
Skills
The Flyweight and Medium have Perception +3, Stealth +7. Why is that? The Giant Solifugid doesn't have any Skills. I suspect this was cribbed from the Giant Wolf Spider's.
Now I'm fine with Solifugids having Perception and Steath, but the Stealth +7 seems a bit high and if your giving junior skills, give the Giant one or both those skills too. It'd only be fair.
Attacks
They should all have their "Forelegs" attack changed to "Foreleg", as they attack once with each leg. Although technically those are pedipalps, so you could use that name.
A couple of the Foreleg escape DC also wrong - Strength alone would give the Medium DC 12 and the Flyweight DC 11, but I'd give the Medium an arbitrary +1 bonus to DC 13 so the progression is a neat 11/13/15.
So that'd be:
[Giant] Foreleg. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: no damage, and the target is grappled (escape DC 15). The solifugid can grapple only one target at a time.
[Medium] Foreleg. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: no damage, and the target is grappled (escape DC 13). The solifugid can grapple only one target at a time.
[Flyweight] Foreleg. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: no damage, and the target is grappled (escape DC 11). The solifugid can grapple only one target at a time.
The Medium has "(with Advantage)" in its bite that should be "(with Advantage if target already grappled)".
[Medium] Bite. Can only attack grappled targets. Melee Weapon Attack: +5 to hit (with Advantage if target already grappled), reach 5 ft., one target. Hit: 9 (2d6 + 2) piercing damage.
That needs to be in the the Giant's bite too, remember.
As in:
[Giant] Bite. Can only attack grappled targets. Melee Weapon Attack: +5 to hit (with Advantage if target already grappled), reach 5 ft., one target. Hit: 18 (4d6 + 4) piercing damage.
I've also just realized the Giant's +4 to its bite damage suggests it could have Strength 18 (+4), but I think the current Strength 16 (+3) is plenty. I'd have no objection to bumping it up if you wanted to, that'd make the Foreleg escape DC 16 and both its foreleg and bite attacks +6 to hit, which is still fair for a Challenge 3 monster.
Challenge Ratings
The 1/8 Challenge Rating of the Flyweight eyeballs a tad low. While it does a piddly 2d4+1 damage, it's certainly tougher than a Wolf, which is CR 1/4 and also has an Advantage gaining combat ability, but with 2/3rd the Hit Dice, a lower AC 13, the same speed and similar physical stats (Str and Con the same, but Dex 15 for a bonus one lower).
Looks more like a 1/4 to me. It's on the edge of 1/2 but isn't quite there. Something like a CR 1/2 Worg would beat it without too much difficulty.
It doesn't need an ally to use its Advantage-granting ability though, and it has 50% more hit points than a Wolf so I'm wondering if it needs tweaking slightly down? I guess the fact it has to hit with a foreleg before it can bite, so might have to spend a round trying to grab an opponent justifies it being a bit lower CR than the numbers say, but it's definitely in the 1/4 ballpark.
The Challenge 1 of the Medium looks OK. It's not that far off from a Worg. The worg's bite is slightly better, with a point more to hit at +5 and a drop more bite damage (2d6+3) but its AC and hit points are lower plus, for some inexplicable reason, it doesn't have Pack Tactics like a Wolf. It may be evil, but you'd think being intelligent and working in concert with goblins it'd know the value of cooperation!
Description
All the descriptions say "They have a large four-jawed mouth". Solifugids do not have four jaws, they have two Chelicerae, so something like "they have two massive fangs for a mouth" would be more accurate.
The Medium Solifugid has "Huge solifugids are around 7 feet long", which should be changed to "Medium solifugids are around 7 feet long".
I'm also thinking that they all would benefit from a note as to their original Source, namely something like "Solifugids first appeared in Q1 Queen of the Demonweb Pits (1980) by Gary Gygax and David C. Sutherland III, the original author was Sutherland."
Skills
The Flyweight and Medium have Perception +3, Stealth +7. Why is that? The Giant Solifugid doesn't have any Skills. I suspect this was cribbed from the Giant Wolf Spider's.
Now I'm fine with Solifugids having Perception and Steath, but the Stealth +7 seems a bit high and if your giving junior skills, give the Giant one or both those skills too. It'd only be fair.
Attacks
They should all have their "Forelegs" attack changed to "Foreleg", as they attack once with each leg. Although technically those are pedipalps, so you could use that name.
A couple of the Foreleg escape DC also wrong - Strength alone would give the Medium DC 12 and the Flyweight DC 11, but I'd give the Medium an arbitrary +1 bonus to DC 13 so the progression is a neat 11/13/15.
So that'd be:
[Giant] Foreleg. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: no damage, and the target is grappled (escape DC 15). The solifugid can grapple only one target at a time.
[Medium] Foreleg. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: no damage, and the target is grappled (escape DC 13). The solifugid can grapple only one target at a time.
[Flyweight] Foreleg. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: no damage, and the target is grappled (escape DC 11). The solifugid can grapple only one target at a time.
The Medium has "(with Advantage)" in its bite that should be "(with Advantage if target already grappled)".
[Medium] Bite. Can only attack grappled targets. Melee Weapon Attack: +5 to hit (with Advantage if target already grappled), reach 5 ft., one target. Hit: 9 (2d6 + 2) piercing damage.
That needs to be in the the Giant's bite too, remember.
As in:
[Giant] Bite. Can only attack grappled targets. Melee Weapon Attack: +5 to hit (with Advantage if target already grappled), reach 5 ft., one target. Hit: 18 (4d6 + 4) piercing damage.
I've also just realized the Giant's +4 to its bite damage suggests it could have Strength 18 (+4), but I think the current Strength 16 (+3) is plenty. I'd have no objection to bumping it up if you wanted to, that'd make the Foreleg escape DC 16 and both its foreleg and bite attacks +6 to hit, which is still fair for a Challenge 3 monster.
Challenge Ratings
The 1/8 Challenge Rating of the Flyweight eyeballs a tad low. While it does a piddly 2d4+1 damage, it's certainly tougher than a Wolf, which is CR 1/4 and also has an Advantage gaining combat ability, but with 2/3rd the Hit Dice, a lower AC 13, the same speed and similar physical stats (Str and Con the same, but Dex 15 for a bonus one lower).
Looks more like a 1/4 to me. It's on the edge of 1/2 but isn't quite there. Something like a CR 1/2 Worg would beat it without too much difficulty.
It doesn't need an ally to use its Advantage-granting ability though, and it has 50% more hit points than a Wolf so I'm wondering if it needs tweaking slightly down? I guess the fact it has to hit with a foreleg before it can bite, so might have to spend a round trying to grab an opponent justifies it being a bit lower CR than the numbers say, but it's definitely in the 1/4 ballpark.
The Challenge 1 of the Medium looks OK. It's not that far off from a Worg. The worg's bite is slightly better, with a point more to hit at +5 and a drop more bite damage (2d6+3) but its AC and hit points are lower plus, for some inexplicable reason, it doesn't have Pack Tactics like a Wolf. It may be evil, but you'd think being intelligent and working in concert with goblins it'd know the value of cooperation!
Description
All the descriptions say "They have a large four-jawed mouth". Solifugids do not have four jaws, they have two Chelicerae, so something like "they have two massive fangs for a mouth" would be more accurate.
The Medium Solifugid has "Huge solifugids are around 7 feet long", which should be changed to "Medium solifugids are around 7 feet long".
I'm also thinking that they all would benefit from a note as to their original Source, namely something like "Solifugids first appeared in Q1 Queen of the Demonweb Pits (1980) by Gary Gygax and David C. Sutherland III, the original author was Sutherland."