Buying skills by buying modes is much more efficient than buying them with improvement points.
In the full-on inject-the-math-directly-into-my-veins character creation mode of Atomic Robo, you have 30 improvement points to spend at character creation. Buying a mode at any level costs its value in improvement points, even though your Good (+3) mode has three ...
Fractional Base Attack Bonus
Pathfinder Unchained contains an optional rule to allow for a higher BAB when multiclassing, based off the fractional advancement of the chosen classes.
One of the Arcane Tricksters problems is that you are taking levels in 3 separate classes that are not full BAB classes, and this puts you behind.
So a Rogue 3 (3 * 3/4 =2.25) ...
Quickened True Strike for +20 1/round
The following trick works with the RAW but exploits several problems in the rules. There will be a section at the end detailing these issues in terms of what's broken and how everything fits together.
So, the basic idea is to sacrifice your swift action to give yourself +20 to hit with your first ...
How High is High Enough?
I'm not sure that you need that high of an attack bonus. Sure, you need to be hitting to deal sneak attack damage, but as an Arcane Trickster you'll often be able to target touch AC. Even low-level spells like Acid Splash and Snowball allow this. For many enemies touch AC is much lower than their regular AC, so that helps a lot.
Here's what I've come up with:
Feat: Ritual Caster. Use this to get Find Familiar. This will allow your familiar to use Help to give you advantage on an attack. Choose an owl so that it can back out without getting hit by an attack of opportunity. As Mattdm pints out, a hostile creature can take the ready action to trigger a reaction attack against the owl, ...
Be old. Don't sleep. Ever.
A Warlock/Sorcerer can convert pact magic spell slots into spell points and then back into spellcasting spell slots. These extra bonus slots are lost on a long rest. The pact magic slots are gained on a short rest. A warlock/sorcerer can expend at most 2 spell slots per round-- one on their action or one on their bonus ...
If an Eldritch Knight is allowed to summon a weapon he has bonded to, 68 damage.
Bonus Action: summon greatsword.
Action: four attacks using great weapon master for 2+5+10 damage each.
If you can't use the greatsword because it's an item you had to buy, 54 damage, using a +1 greatsword pact weapon that an Eldritch Knight 11 / Warlock 9 created and then ...
Given the following restrictions:
No items, boons, temporary conditions, or expending limited resources.
All attacks hit, but do not crit, and all damage dice are minimized.
A 20th level PC can reliably do 44 damage per turn. (Partial credit to DavidCoffron)
Requirements by 20th level:
Ability Scores: 20 Strength, 20 Charisma, Dexterity 13+, Wisdom 13+
Level 20 Moon Druid for the following features:
You gain the ability to use Wild Shape on your turn as a bonus action, rather than as an action. [...]
[...] Starting at 6th level, you can transform into a beast with a challenge rating as high as your druid level divided by 3, rounded down.
I'm sure this might change if someone else comes up with something more damaging but a level 17+ warlock with 20 CHA and the Agonizing Blast invocation casting Eldritch Blast. If we assume each attack hits then that's 4d10+20 damage reliably. That's a minimum of 24 and a maximum of 60 DPR with no resource cost and no items required.
This would not be a punishment as long as they can doff the armor.
From the PHB p 14:
Without armor or a shield, your character's AC equals 10 + his or her Dexterity modifier.
So, with an average dexterity modifier they would still have an AC of 10. If they have a negative dexterity modifier then the AC would go down. With standard array or point buy ...
355 damage, or 467 with setup
Half-Orc for Savage Attacks
2 Fighter levels for Action Surge
2 Paladin levels for Divine Smite, searing smite, and 1 caster level
2 Divination Wizard levels for booming blade, absorb elements, Portent, and 2 caster levels
14 Forge Cleric levels for Blessing of the Forge, bestow curse, 3 ASI (Great Weapon ...
Without setup you can deal at least 375 damage
We will need a Half-Orc Warlock (11) / Paladin (2) / Assassin Rogue (7).
These get us Savage Attacks, branding smite, Hexblade's curse, the Eldritch Smite Invocation, Divine Smite, Sneak Attack, and Assassinate. On top of this we need the Martial Adept feat and the Orcish Fury feat, and we ...
212 damage, or 260 with setup
Bugbear for Surprise Attack
9 Hexblade levels for eldritch blast, hex, Agonizing Blast, Hexblade's Curse, Sign of Ill Omen (grants bestow curse), and 5th level spell slots
3 Assassin levels for Assassinate
3 Sorcerer levels for Subtle Spell
2 Fighter levels for Action Surge
Notable ability scores: 13 dexterity, ...
The maximum result for a Stealth bonus with those restrictions is 141
(a minimum of +65 with 1s on all the dice, and an average of +103)
Our four allies are listed below:
A bard 20 ----------------------------------------------- (for guidance via Magical Secrets, Bardic Inspiration, and Boon of Fate)
A Circle of the Dreams druid 20 --------------...
A 20th level character with the Boon of Fate can add +1d10 to the ability check of one target within 60 feet as a non-action. Since Epic Boons are not " spells,
class features, feats, racial traits, monster abilities, [or] magic
items" (DMG errata) and no other text includes epic boons within the definition of 'game features', they are not ...
Paladin is the best class for this, because divine grace is arguably the best single class feature in the entire game. The enlightened paladin can get Cha-to-AC when unarmored, but it’s limited to paladin level so ignore that. Smite evil also adds Charisma to attack rolls, but since you’re limited in who you can apply that to and how often you can do it, you’...
At most +146.
This does not include the 20 from the d20. The maximum rolled result would be 166.
Your character must have...
At least 10 levels in Ranger, to get Hide in Plain Sight.
At least 3 levels in Bard, to get Expertise.
At least 6 levels in Warlock (The Fiend), to get Dark One's Own Luck.
20 levels total.
Dexterity score of 20. You ...
It's Unearthed Arcana content, but the Artificer Battle Smith allows for +Intelligence to weapon attacks and damage which is a perfect fit for both GWF and Elven Accuracy.
Battle Smith is proficient with martial weapons and medium armor, which is a good start, but things just get better ...
2 power points don’t really help much with manifesting
So power points are used to manifest psionic powers, e.g. with the psion class, but 2 more doesn’t make a huge difference. So the Wild Talent feat doesn’t really help very much with being a psion, nor does it really make a good reason, by itself, to multiclass into psion.
Mixing spellcasting and ...
Buy out your drow LA.
There's a variant rule for buying off LA; IIRC it originally came from the book Unearthed Arcana. Once you reach a certain level, you pay some XP and the LA goes away since your race's advantages have become largely redundant by that level. My advice in this post will have assumed that you have done so. For a Drow's LA of +2, you could ...