Spellcasting Guide: Builds & Tips

Why Underkeep Spellcasting Rewards Planning

Underkeep spellcasting is not a side system you can ignore until the first boss. It shapes your class path, your gear priorities, and every turn in this turn-based dungeon crawler. Good Underkeep spellcasting starts before combat: with a party of four adventurers, every spell choice competes with another useful option.

In a game where you can take as much time as you want to think out your next move, spells should be chosen for the encounter, not for raw novelty. The system rewards preparation. You do not need to bring the perfect magic type to every fight, but endgame bosses and challenges give a noticeable benefit when you use the correct one. That is why spell planning matters more than collecting every flashy spell you find.

Table 1: Where preparation pays off

| Situation | What to prioritize | Practical takeaway | | PvE bosses and endgame challenges | Correct magic type | Preparation is rewarded; a matching type gives a noticeable benefit | | PvP | General magic resistance and bonuses | Specific elemental building matters less than flexible spell choices | | Early generalist build | Low-cost utility and lesser spells | Keep the toolkit lean; general stats have a lower ceiling | | Focused subclass build | Form-specific magic power | Commit gear and spell space to one magic form for a higher ceiling |

This table is not a tier list. It is a way to decide what your spell wheel must solve. A generalist can cover more situations, but the tradeoff is a lower ceiling. A specialist can hit harder with one form, but the build becomes easier for other players to read.

How Underkeep Spellcasting Works: Magic Types and Class Paths

There are seven base magic types. Four are elemental: fire, water, earth, and air. Three are fundamental: arcane, holy, and dark. All other forms of magic derive from those seven bases. That matters because PvE encounters can reward the correct type, while PvP resistance and bonuses are more general.

The class path is the second pillar of Underkeep spellcasting. Magic-innate classes begin as generalist magic users with access to lesser spells. Subclassing later gives them a specific magic form. Martial classes are not meant to be locked out of magic entirely; the design goal is for traditionally martial classes to have at least one magic focus subclass. That access is part of the subclass kit, not full mastery.

Table 2: Magic families and what they mean for your build

| Family | Types | Build note | | Elemental | Fire, water, earth, air | Useful for matching PvE encounters; PvP treats resistance more generally | | Fundamental | Arcane, holy, dark | Another layer of encounter preparation; other forms derive from these bases | | General magic | Lesser spells across types | Good for early flexibility, but general stats have a lower ceiling | | Form-specific magic | Focused subclass magic | Higher stat ceiling, but requires commitment and readable gear choices |

Table 3: Class routes into magic

| Route | Magic access | Caution | | Magic-innate class before subclass | Generalist lesser spells | Do not spread too thin; subclass focus is where the ceiling rises | | Magic-innate class after subclass | Specific magic form | Commit spell wheel space and gear to that form | | Martial class with a magic focus subclass | Magic as part of the subclass kit | Access is not mastery; treat it as a defined part of the playstyle |

The practical lesson is simple: decide whether your character is a bridge or a specialist. A bridge covers gaps in the party and uses lesser spells to enable others. A specialist chooses one form and builds around its strengths. Neither approach is wrong, but they demand different spell wheel budgets.

Spell Wheel Capacity: The Real Build Constraint

Spell wheel capacity is the core constraint in Underkeep spellcasting. The number of spells you can equip is not based on a stat like Intelligence. It is based on how much you can cram into the spell wheel. Stronger spells take up more space. That makes balancing direct: a powerful spell competes with several weaker options.

The system also separates spell count from gear. Gear does not decide how many spells you can carry. It makes the spells you cast stronger. That distinction is important. Do not chase gear assuming it will solve a crowded wheel. Chase gear that amplifies the spells already earning space.

Table 4: Spell wheel budgeting

| Spell tier | Wheel impact | Best use | | Level 1 | Lower space cost | Setup, utility, and low-cost combo pieces | | Level 2 | Moderate space cost | Core damage, debuffs, and reliable answers | | Level 3 | More space, reserved for the major casting spell wheel | Decisive fights and encounters that justify the cost | | Level 4 | More space, reserved for the major casting spell wheel | High-impact casting with a heavy opportunity cost | | Arcane Rift | Half of a spell wheel | Portal utility that consumes a huge share of your budget |

Before you equip a spell, ask four questions:

• Does it start or extend a combo?
• Does it cover a magic type your party lacks?
• Does it replace two or more lower-cost options?
• Does your gear make it strong enough to justify the space?

Those questions keep the wheel honest. A spell can be powerful and still be a bad fit if it leaves no room for setup, defense, or a second damage type. The goal is not to fill every slot. The goal is to make every slot answer a problem your party will actually face.

Cryomancer Combo Example: Chill and Shatter

Cryomancer is the clearest example of Underkeep spellcasting as a combo system. Many cryomancer spells apply chilled, a frosty debuff that reduces move speed and attack speed. Perks can reward you for stacking chill on enemies. The payoff spell, Shatter Rhyme, consumes those stacks to deal damage and reduce armor.

Table 5: Basic chill combo

| Step | Action | Result | | 1 | Apply Chill with cryomancer spells | Enemy is slowed and carries chill stacks | | 2 | Track the stack count | You decide whether to keep stacking or cash out | | 3 | Cast Shatter Rhyme | Chill is consumed for damage and armor reduction | | 4 | Follow with party pressure | Reduced armor makes the payoff window more valuable |

This is why spell combinations matter more than isolated damage numbers. Shatter Rhyme is not just a button you press when it is off cooldown. It is a decision about timing. Spending chill early can create a burst window. Holding chill can extend control. The right answer depends on who you are fighting, where you are fighting, and how many players or enemies are involved.

A practical cryomancer tip: pair your chill application with a clear party follow-up. If your allies cannot use the armor reduction or the control window, the combo loses value. This is also why the spell wheel needs room for both the setup spell and the payoff spell. A payoff without a setup is just an expensive slot.

Practical Underkeep Spellcasting Tips for PvE and PvP

The best Underkeep spellcasting habits come from treating the wheel as a plan, not a collection. Use the turn-based pace to read the encounter before you commit. In PvE, build one version of the wheel for magic-type preparation and another for general exploration. In PvP, keep the wheel flexible because magic resistance and bonuses are more general than they are in PvE.

Table 6: PvE versus PvP spell priorities

| Decision | PvE priority | PvP priority | | Magic type | Match the boss or challenge when possible | Do not rely on one type being decisive | | Wheel space | Include the correct answer plus a backup | Include reliable setup and immediate payoff | | Gear | Amplify your chosen form | Do not expect gear to add spell capacity | | Subclass | Focus one form for a higher ceiling | Balance flexibility against a lower generalist ceiling |

More actionable tips:

• Pick your subclass before you pour gear into magic power. Form-specific power has a higher ceiling, but it demands commitment.
• Keep at least one setup spell and one payoff spell. Chill plus Shatter Rhyme is the clearest example, but the principle applies to other combinations.
• Treat level 3 and level 4 spells as major wheel investments. They belong in the major casting spell wheel, not in every loadout.
• Do not ignore martial magic focus subclasses. They provide access to magic as part of the subclass kit, but they are not built for mastery.
• In PvE, prepare for the correct magic type even if it is not strictly required. The reward is noticeable, especially in endgame bosses and challenges.
• In PvP, expect other players to read your build. The stronger and more specific your gear, the easier your playstyle is to identify.

One last planning note: the game is designed around tradeoffs. General stats give you a lower ceiling. Form-specific magic power gives you a much higher ceiling. That tradeoff is not a flaw to work around; it is the reason builds feel different. A player who understands the tradeoff will make better spell wheel choices than a player who simply equips the strongest-looking spell.

FAQ

Is Underkeep spellcasting tied to Intelligence?
No. Underkeep spellcasting uses spell wheel capacity instead of a stat like Intelligence. Stronger spells take up more room, so the real question is whether a spell deserves its share of the wheel.

Can martial classes use Underkeep spellcasting?
They are intended to have access through magic focus subclasses. That access is part of the subclass kit, but it is not the same as mastering a magic form. Magic-innate classes start as generalists and later focus through subclassing.

What is the best magic type in Underkeep?
There is no single best type supported by the system. Fire, water, earth, air, arcane, holy, and dark all matter. PvE rewards using the correct type for bosses and challenges, while PvP uses more general magic resistance and bonuses.

How does Chill work with Shatter Rhyme?
Chill slows move speed and attack speed, and cryomancer perks can reward stacking it. Shatter Rhyme consumes chill stacks to deal damage and reduce armor, so the combo is strongest when your party can use the control or armor reduction.