Poison Spear 99 Nights in the Forest is one of the headline rewards from the Frog Invasion update, paired with the equally rare Poison Armor. This guide focuses on the exact steps to reach the boss that drops them, how the key-gate works, the confirmed drop rates, and why these poison items are worth the grind.
What is Poison Spear 99 Nights in the Forest?
Poison Spear is a rare weapon with added poison damage that performs well in close to mid-range encounters. Its damage-over-time effect gives you pressure beyond the initial hit, making each connection count even after you disengage. Poison Armor complements that playstyle by providing extra protection alongside poison resistance, which is especially useful when fights demand survivability and status mitigation. When used together, Poison Spear and Poison Armor form one of the strongest poison-oriented equipment pairings in the game, turning successful runs into clear power spikes for your character.
How to Get Poison Spear and Poison Armor
The path to both items runs through the Frog King boss fight inside Frog Cave. Accessing the cave requires preparation, but the steps are straightforward once you know the sequence.
1) Collect 8 Frog Keys from ponds
Frog King’s door is locked behind eight slots. Each slot corresponds to a Frog Key found at a different pond across the map. Search ponds for glowing points in the water; each location holds a single key. You will need all eight keys before you can open the cave door, so plan a route that sweeps the map efficiently and mark ponds you have already cleared to avoid backtracking.
2) Enter Frog Cave via the giant whirlpool
Once you have all 8 Frog Keys, locate the giant whirlpool on the map and jump in. This transports you to the Frog Cave area, where you can slot the keys into the door and unlock the arena.
3) Defeat the Frog King
After the door opens, you enter a dedicated boss room. Winning the fight grants access to a reward chest. There is no alternative source for Poison Spear or Poison Armor; the chest is the exclusive method tied to this encounter, so repeat clears are part of the progression plan if you are aiming for both pieces.
4) Understand the drop rates
The reward chest uses low-probability drops, which means consistent farming is the expectation if you want specific items:
Poison Spear — 3%
Poison Armor — 1%
Blowdart — 1%
Frog Boots — 1%
Because the percentages are small, many players will need multiple victories before seeing either item, and Poison Armor in particular is among the rarest pulls from this table.
Why the grind is worth it
Poison Spear’s added poison damage lets you stack pressure while repositioning, and Poison Armor’s defense plus poison resistance helps you stay active during tougher encounters. Together they offer a blend of output and durability that is difficult to replace. If you are targeting a reliable poison kit for demanding content, these two rewards justify the repeated clears required by the drop rates.
Final Thoughts
Poison Spear 99 Nights in the Forest and Poison Armor come from a single loop: gather 8 Frog Keys from ponds, jump into the giant whirlpool to reach Frog Cave, unlock the door, and defeat the Frog King to open the reward chest. With drop rates set at 3% for Poison Spear and 1% for Poison Armor, plan for multiple runs and treat each clear as progress toward a long-term upgrade. The payoff is a top-tier poison setup that meaningfully improves both your damage uptime and your survivability in the content introduced with the Frog Invasion update.