How to Defeat Zil & Thungr: Plains Miniboss Strategy, Gear & Rewards

What Makes This Fight Unique

Zil & Thungr hold the distinction of being Valheim's first and only duo miniboss encounter. Found at the bottom of the Sealed Tower in the Plains biome, these two work together in a way that no other fight in the game replicates. Thungr is the muscle: a massive, blue-skinned Fuling brute wielding a devastating club. Zil is the brains: a cunning Fuling shaman who slings Fireballs and casts protective barriers over his partner. Together, they are more than the sum of their parts.

This fight is part of Hildir's Request questline. Hildir is a trader NPC who marks three Sealed Tower locations on your map. Clearing each one earns you a chest that you return to Hildir to unlock cosmetic trades. Zil & Thungr guard Hildir's Bronze Chest, the final and most challenging of the three.

The good news? This is fundamentally a tactics fight, not a gear check. Veterans have cleared these two with Plains-level gear, and some have even done it with Black Forest equipment. The tower itself is your greatest weapon if you know how to use it.

Understanding Their Attack Patterns

Thungr has two attacks, and learning the timing difference between them is critical. His regular club swing covers a 4-meter, 70-degree arc and deals 150 Blunt damage (plus 100 Chop and 40 Pickaxe that only affect terrain). He can use this every 2 seconds when you are within 3 meters. The tricky part is that this swing has two variations: a standard swing and a delayed swing with roughly a 0.3-second timing difference. That tiny delay has killed many players who dodge too early.

His Rage Attack is the real spectacle. Thungr slams his club into the ground three times in succession, stepping forward with each swing. Each slam covers a 4-meter, 60-degree vertical arc and deals 130 Blunt damage. He uses this every 20 seconds when you are within 6 meters. The stepping-forward animation is what catches people off guard because you think you are at a safe distance, and then he closes the gap.

Zil is the more dangerous of the two despite his lower health pool. His Fireball deals 20 Blunt and 100 Fire damage and inflicts the Burning status effect, which ticks additional damage over time. He fires these every 12 seconds from up to 20 meters away. The Fireball travels at 15 meters per second with a spread of 4 to 20 degrees, so it is not perfectly accurate, but in the tight confines of the tower basement, accuracy barely matters.

Zil's Protect ability is what makes fighting both of them simultaneously so frustrating. He casts a barrier on all allies within 6 meters that absorbs up to 100 damage or lasts 40 seconds, whichever comes first. With a 40-second cooldown, this means Thungr has a protective shield for roughly half the fight. You need to either burst through the shield or wait it out.

Here is the critical detail most guides miss: when Thungr dies first, Zil's attack pool reverts to that of a regular Fuling Shaman. He loses his special Fireball and Protect abilities and becomes significantly less threatening. This is why the kill order matters so much.

Finding and Navigating the Sealed Tower

Every world generates exactly 3 Sealed Towers in the Plains biome. To find them, visit Hildir (one of Valheim's trader NPCs) and interact with the map near her location. She will mark all three Sealed Tower positions on your world map.

The Sealed Tower is made of unbreakable black stone with sealed windows, arrow slits, and wood panels. The real entrance is at the roof of the tower, which is heavily guarded by Fulings. You will need to build your way up the outside of the tower using ladders or scaffolding. Once on top, you work your way down floor by floor.

The tower has roughly five floors. The top four are gauntlets filled with regular Fulings, Fuling Shamans, and hidden Traps buried under straw piles. Always check the floor before stepping forward. You cannot build or deconstruct anything inside the tower interior, so you cannot cheese your way through with walls or platforms.

The bottom floor is the boss arena where Zil & Thungr wait. There are also two or three special Plains Chests down here containing guaranteed Coins (44-165), an Egg, Chains (2-5), and Amber Pearls (2-4). Do not forget to loot these after the fight. The Egg alone makes the tower worth clearing, since it lets you start a Chicken farm.

A smart move is to build a Portal at the roof of the tower before heading inside. The upper floors can be punishing, and having a quick retreat option saves time if things go wrong.

Resistances and Damage Tips

Both Zil and Thungr take neutral (1x) damage from Blunt, Slash, Pierce, Fire, Frost, Lightning, and Poison. They are completely immune to Spirit, Chop, and Pickaxe damage. This means you have total freedom in weapon choice; nothing is resisted, so pick whatever you are most comfortable with.

The Ooze Bomb strategy works because Poison deals full damage to both of them. Each bomb creates a 4-meter AoE cloud lasting 10 seconds, dealing 40 Poison damage over 7 seconds to anything inside it. If an enemy stays in the cloud, the damage refreshes, dealing up to 97 total Poison damage per bomb. In the cramped boss room, they cannot escape the cloud easily.

Zil's Fireball is the attack you need to respect most. The 100 Fire damage plus Burning status effect adds up fast. Fire Resistance Barley Wine is strongly recommended. It is crafted from a base made in a Mead Ketill using 10 Barley and 10 Cloudberries, then fermented for two in-game days to produce 6 wines. Each gives 10 minutes of fire resistance, which is more than enough for this fight.

Bonemass Forsaken Power is the best choice here. It grants a flat 50% reduction to Blunt, Slash, and Pierce damage, which covers Thungr's entire damage output. Combined with Fire Resistance Barley Wine for Zil's Fireballs, you become extremely hard to kill.

Rewards: What You Get for Winning

Defeating the duo earns you three items: the Zil Trophy, the Thungr Trophy, and Hildir's Bronze Chest (dropped by Zil specifically). The trophies are wall-mountable collectibles. The Bronze Chest is the real prize, and it is a quest item.

Hildir's Bronze Chest weighs 200 units and cannot be teleported through a Wood Portal (though it can go through a Portal Stone). You will likely need to carry it back to Hildir by boat. Once returned, it unlocks a tier of cosmetic trades including Beaded Dresses (brown, blue, yellow), Beaded Tunics (blue, red, yellow), Twisted Headscarf Red, Fur Cap Grey, Extravagant Cap Orange, and Basic Fireworks.

Do not overlook the special Plains Chests in the boss room itself. They always contain Coins (44-165), an Egg for starting a Chicken farm, Chains (2-5), and Amber Pearls (2-4). The Egg is arguably the most valuable reward from the entire tower.

Alternative Strategies

The stairway peeking method is the safest approach, but it is not the only way. If you want to get creative, there are a few other proven strategies.

The full Ooze Bomb method takes the cheese to its logical conclusion. Bring 30+ Ooze Bombs, stand in the stairway or at windows above the boss room, and throw bombs until both are dead. You never have to enter the arena at all. Some players even dig down to the basement level from outside the tower with a Pickaxe and throw Ooze Bombs through the walls combined with Stagbreaker ground pounds.

The bow-only method works but takes patience. Sit at the bottom of the stairway and peek out to fire arrows at Thungr. Root Armor combined with a Huntsman Bow is enough, though it takes a long time. The main risk is Zil's Fireballs, which can hit you around corners if you are not careful about your positioning.

For co-op groups, the fight becomes much simpler. One player tanks Thungr at the bottom of the stairs while the other focuses ranged damage on Zil. With Zil down quickly, Thungr is just a big health pool to whittle through. Just remember: even in co-op, killing Thungr first is usually the better play because it strips Zil of his dangerous abilities.

Lore and Trivia

The duo's trophy descriptions reveal an interesting relationship. Zil is actually the older of the two despite being significantly smaller. They envy each other: Zil is jealous of Thungr's raw physical strength, while Thungr is jealous of Zil's magical power. This dynamic is likely inspired by "Master Blaster" from the 1985 film Mad Max: Beyond Thunderdome, where a small, intelligent character rides on the shoulders of a large, powerful one.

A few fun quirks from the game files: Zil can still cast his elemental attacks while swimming, making him one of the few creatures that remains dangerous in water. When spawning Thungr with cheats, his corpse appears the normal green color instead of his distinctive blue. And starred variants of Thungr spawned via console commands turn brown, while Zil's stay their normal color.