11
\$\begingroup\$

I was considering this Q&A: What is the highest possible AC?

I was curious about whether any attack roll could ever get high enough to hit such an AC (short of scoring a critical hit, which ignores AC), and that got me thinking: How high can the bonus to an attack roll get?

I'm not interested in the amount of damage done, just the static bonuses or additional dice rolls that can be added to the attack roll, hence I'm also not interested in the actual number rolled on the d20 attack roll, but if it matters, assume it's not a critical hit (and no, using Portent doesn't count as making it static; I want to exclude the d20 attack roll entirely). The bonus can be temporary or situational, hence buff spells are allowed.

Any magic items, help from friends, feats and Epic Boons, official races/classes/subclasses are allowed, but UA is not allowed, and nor is anything involving any kind of polymorph/wild shape. The "help from friends" is also subject to these restrictions, so no polymorphing or monstrous allies, only normal PCs with official races/classes/subclasses/spells, so examples of such help (which was provided to me by comments) would include things like Bardic Inspiration, bless, Guided Strike, War God's Blessing, etc.

Also assume that the maximum ability score range is 20, with the exception of Barbarians going up to 24 in STR and CON at level 20 (in other words, no Manuals/Tomes to get an ability score to 30, and no other magic items that increase your maximum such as Ioun Stones or Deck of Many Things, but class features that do the same are OK). We can also assume rolling ability scores with lucky rolls so we can have almost any ability score at 20. Also note that Ioun Stones that increase other things are fine, just not ability scores.

Effects with the same name should only be used once each, I don't want things stacking if they are the same feature/spell/etc, only different features/spells/etc. We can also assume convenient luck on any other features, such as happening to roll just below what we need on the attack to miss (if we assume a ridiculous AC from that linked question), thus activating a Hobgoblin's "Saving Face" racial feature, or rolling whatever we need from the Wild Magic Surge table.

The best I can think of off the top of my head is a level 20 Ranger (so proficiency bonus of +6) with 20 DEX, the Archery Fighting Style (+2), and is shooting their +3 Longbow at one of their favoured enemies, thus adding their WIS (also 20) to the attack roll, so that's 6 + 5 + 5 + 3 + 2 = +21 bonus (this is excluding buffs, since I didn't think of any at the time I originally wrote my first attempt).

Can we do better than that within the restrictions I've specified above?

\$\endgroup\$
14
\$\begingroup\$

+135 with 20 Dex, 20 Cha and optimal rolls

Character Stats

  • Dexterity 20: +5 (or +10 for Dexterity 30)

  • Charisma 20

  • Level 17+ proficiency bonus: +6

Racial Traits

  • Hobgoblin: Saving Face: +5 (requires our attack roll to initially miss)

Class Features

  • War Domain Cleric 6: Channel Divinity: Guided Strike: +10

    • Second use of Channel Divinity
  • Battlemaster Fighter 10: Archery Fighting Style: +2

    • Precision Attack: +1d10
  • Devotion Paladin 2: Channel Divinity: Sacred Weapon: +5 (or +10 for Charisma 30)

  • Divine Soul Sorcerer 1: Favored by the Gods: +2d4 (requires our attack roll to initially miss)

Magic items

Assistance from allies

  • Alchemist Artificer 3: Experimental Elixir: Boldness: +1d4

  • Bard 15: Bardic Inspiration: +1d12

  • War Cleric 6: War God’s Blessing: +10

  • Wild Magic Sorcerer 6: Bend Luck +1d4

  • Bless: +1d4

Epic Boons

  • Ally with Boon of Fate: 1d10
  • Boon of Luck: 1d10
  • Boon of Peerless Aim: +20

Final result

= 5 + 6 + 5 + 10 + 2 + 5 + 9 + 1 + 10 + 20 + 1d10 + 2d4 + 1d4 + 1d12 + 1d4 + 1d4 + 1d10 + 1d10

= +108.5 on average (+118.5 for DEX 30 and CHA 30); +135 (+145) on optimal rolls

Without Epic Boons, the result is +77.5 (87.5) on average or +95 (105) on optimal rolls.

\$\endgroup\$
  • 1
    \$\begingroup\$ Thank you to everyone who has contributed to this answer so far, this is looking like a great answer! \$\endgroup\$ – NathanS Jun 22 at 10:25
  • 2
    \$\begingroup\$ See my answer on Oil of Sharpness. I argue it does not stack. \$\endgroup\$ – Thomas Markov Jun 22 at 10:40
  • 2
    \$\begingroup\$ Note for further iterators: 15 of the fighter levels are only to upgrade from a d8 to a d12, so different class levels which give a greater benefit can be considered. Worst case it can be obtained with a feat, then using a d6. \$\endgroup\$ – Someone_Evil Jun 22 at 13:39
  • 1
    \$\begingroup\$ Blessing of the Forge: At 1st level, you gain the ability to imbue magic into a weapon or armor. At the end of a long rest, you can touch one nonmagical object... no bueno for +3 bow. \$\endgroup\$ – Davo Jun 26 at 18:08
  • 1
    \$\begingroup\$ @Davo Ah good catch, my bad on that one \$\endgroup\$ – Medix2 Jun 26 at 18:09

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.