Aw, crap. More spam!

My goal is to make Isle of Dread and The Lost City playable in FC.

[Nightshade, Nightwalker]

Nightshade, Nightwalker

The deadly nightshades are large, powerful evil beings which seek to spread death. They are extremely rare, usully created or summoned for a special purpose by a more powerful being.They have no visible eyes, apparently sensing their surroundings magically. The mere presence of a nightshade spoils food and water, and a chill surrounds them that negates any chance of surprise if the victim has encountered a nightshade before. The nightwalker appears similar to a giant of some type, but jet black in color and without carried items, standing 20' tall.

Nightwalker (Huge Undead Spirit Flyer/Walker -  166 XP): Str 22, Dex 8, Con 16, Int 18, Wis 18, Cha 12; SZ H (3x3, Reach 3); Spd  20 ft. flying, 40 ft ground; Init IV; Atk IV; Def X; Res III; Health III; Comp V; Skills: Resolve VI, Spellcasting X; Spells: Cloudkill, Counter Magic II, Darkness II, Detect Magic, Finger of Death, Haste, Insanity II, Invisibility, See Invisible, Tongues II; Qualities: banned actions (Blend), darkvision II, DR 8, fearless I,  feat (Hidden Spells, Iron Will), interests (Alignment-Chaotic), nocturnal, spell defense III, tough II, unlimited spell points, veteran I
Attacks/Weapons: Slam V (3d10+6 lethal + lethal poison, keen 8, Threat 18-20, upgrades: venomous, keen x2), Evil Gaze (fatiguing attack IV: Fort DC 25 or be be fatigued, gaze)
Treasure: 1L, 2M

I think +0, +1, +2 is too fast for Slow. Really, the concern is disparities at mid and high levels. If you want to go from +0 to about +12, why not make it symmetrical? -1 at Level 1, and -1 every third level.  So,

1 +0
2 +1
3 +1
4 +2
5 +3
6 +3
7 +4
8 +5
9 +5
10  +6
11 +7
12 +7
13 +8
14 +9
15 +9
16 +10
17 +11
18 +11
19 +12
20 +13

2)I'm designing my campaign setting, and I'm a bit worried about the Burden of Ages. Isn't it a bit too step penalty, or it works fine? I can't judge clearly from paper, and it should need more than an adventure to test out. Did any of you modify the basic elven race by removing this trait? If so, how did you balance it?

I hashed out this version of an elf a while back, based on the Palladium "better than you" version, better looking, faster, and tougher, but a little prickly. The main tradeoff is the loss of the Tolkien-inspired ridiculously good senses.

Elf
Medium (1x1) Folk with a Reach of 1
Base Speed: 35 ft
Abilities: +2 Dexterity
Aloof: Your error range increases by 2 when making Impress and Sense Motive checks targeting characters of other species.
Tenacious Spirit: You gain 1 additional vitality point per level.
Enlightened Notice: Your maximum Notice rank increases to your Career Level + 5. Only the highest bonus from any single enlightened ability may apply to each skill.
Natural Elegance: Your Appearance bonus increases by +1.
Darkvision I: You ignore the effects of dim and faint light.

Is creating new pages a bad thing in its present indisposition?

[Nightshade, Nightcrawler]

Here's a TPK waiting to happen...

Nightshade, Nightcrawler

A nightcrawler is a massive behemoth similar to a purple worm, though utterly black in color. A nightcrawler measures about 7 feet in diameter and is 100 feet long from its toothy maw to the tip of its stinging tail. It weighs about 55,000 pounds. A nightcrawler attacks by burrowing through the ground and emerging to strike.

Nightcrawler (Gargantuan Undead Burrower/Walker - 226  XP): Str 28, Dex 10, Con 10, Int 14, Wis 14, Cha 12; SZ G (4x8, Reach 3); Spd  30 ft. ground, 60 ft burrowing; Init VI; Atk III; Def X; Res VI; Health VII; Comp V; Skills: Notice IX, Resolve IX, Search IX, Spellcasting VIII; Spells: Darkness II, Detect Magic, Cone of Cold, Counter Magic II,  Devotion Hammer, Insanity II, Invisibility, See Invisible; Qualities: blindsight, class ability (Mage: arcane wellspring II,  spell secret [Counter Magic II, Devotion Hammer]), DR 10, feat (Combat Focus, Great Fortitude, Hidden Spells, Iron Will), frenzy I, interests (Alignment—Chaotic Evil), nocturnal, spell defense IV, telepathic, tough III, veteran I
Attacks/Weapons: Bite III (2d12+14 lethal + ebola, Threat 17-20, upgrades: diseased, grab), Tail (Gore III: 2d10+14 lethal + weakening poison, Threat 18-20, bleed, upgrades: venomous), Swallow I (2d8 acid, grapple benefit, upgrades: alternate damage), Soul Draining Attack IV (Fort DC 25 or standard characters dies or special character loses 1 action dice and 10 maximum vitality, upgrades: supernatural attack--Swallow)
Treasure: 1C, 1L, 1M

p.275, the Minotaur's Gore attack lists bleed as an upgrade, when it is a quality of all Gore attacks.

[Weasel]

Weasel

These little mammals are aggressive predators but usually confine themselves to smaller prey. The statistics presented here can also apply to ferrets. If a weasel hits with a bite attack, it uses its powerful jaws to latch onto the opponent’s body

Weasel (Tiny Animal Walker -  39 XP): Str 3, Dex 12, Con 10, Int 2, Wis 11, Cha 5; SZ T (1x1, Reach 1); Spd 20 ft ground; Init IV; Atk II; Def I; Res V; Health I; Comp -; Skills: Acrobatics III, Athletics III, Blend III, Notice II, Sneak III, Survival I; Qualities: improved senses (scent), superior climber I, tricky (Relentless Attack)
Attacks/Weapons: Bite I (1d4-4 lethal, Threat 18-20, upgrades: grab)
Treasure: none

[Grimlock]

Grimlock

Grimlocks are blind, but their exceptional senses of smell and hearing allow them to notice foes nearby. As a result, they usually shun ranged weapons and rush to the attack, brandishing their stone axes.

Grimlock (Medium Folk Walker - 47  XP): Str 12, Dex 10, Con 10, Int 10, Wis 8, Cha 6; SZ M (1x1, Reach 1); Spd 30 ft ground; Init III; Atk VII; Def IX; Res V; Health III; Comp II; Skills: Athletics III, Notice IV, Survival III; Qualities: blindsight, chameleon II (caverns/mountains), DR 1, improved sense (scent)
Attacks/Weapons: crude axe (wielded in two hands) (1d10+1 lethal, Threat 20, AP 2, S/1h, Hard 1)
Treasure: 1C, 1G, 1L

I will always call half liter glasses pints.

See? SI is better, it makes the pints slightly bigger.

Thanks for the spell defense tips everyone. I'm having another conundrum , one of my players has elemental legacy and wants to use the ability to gain the elemental type, my question is what happens if he dies? He will be banished I know but then how do you bring a banished character back? I don't think resurrection would work because he wouldn't technically be dead.

I suspect I would invent a Gate spell that has the same casting time and prep cost as one of the Resurrect spells. If it were used to summon something besides a banished PC, I guess it would need an XP limit.

A naive take from the rule would be Interest- Lute. If you had a lute, you might get a +1 to appropriate skill checks, like trying to Influence a receptive crowd or maybe trying to distract people by playing a lute.

At Int 5 I'd seriously consider not allowing the player to talk at the table.

I've done enough psychometric testing to tell that you someone can have borderline intellectual functioning, edging into cognitive disability, and you wouldn't necessarily know it by talking to them.

Swarm is a pretty functional solution to anything that could be gang of mooks. Simplifies combat really quick.

That's basically how I used to run d20 Star Wars; each group of stormtroopers used the Aid action to make one roll against one target.