Broken Blade Calculator
Boss farm planner and reroll odds tool — compare drop rates, estimate kills for rerolls and endgame mats (Holy Grail, Soul Ore), and model Race, Element, and Blessing hit chances.
By Bloxron Editorial Team · Last updated
Plan boss farms and reroll sessions before you grind. The farm planner uses the same drop rates and respawn timers as the bosses guide, plus Sky Spire floor estimates for Holy Grail and Soul Ore — see the Ascension guide for farm order. Reroll odds pull from the races, elements, and blessings tier lists.
Farm inputs
Compare boss and Sky Spire efficiency for rerolls and endgame materials. See the bosses guide and Ascension guide for full drop tables and farm order.
Farm results
Recommended
Velik
Velik: 84.75% drop · ~12 kills · ~10m
| Boss | Rate | Kills | Time |
|---|---|---|---|
| Ragaros | 79.42% | ~13 | 8m 40s |
| Magador | 71.43% | ~14 | 9m 20s |
| Velik ★ | 84.75% | ~12 | 10m |
| Moraros | 67.43% | ~15 | 10m |
| Niflor | 20.19% | ~50 | 1h 3m |
| Surtrik | 20.19% | ~50 | 1h 3m |
| Hraegon | 20.19% | ~50 | 1h 3m |
| Thorvak | 20.19% | ~50 | 1h 3m |
How to use this calculator
Step 1. Pick a tool tab
Boss Farm Planner estimates kills and time for reroll or material drops. Reroll Odds models Race, Element, and Blessing hit chances — switch tabs at the top.
Step 2. Farm: set your target drop
Choose what you need — reroll mats, Crimson Beherit, Holy Grail, Soul Ore, or another tracked drop. Enter how many you want and your average kill or floor-clear time in seconds.
Step 3. Farm: read the boss table
The recommended row matches the bosses wiki farm priority (Velik for Element, Sky Spire F61–100 for Holy Grail, Charon for Soul Ore). Sky Spire bands use estimate ranges — compare alternate sources by expected clears and total time.
Step 4. Reroll: choose type and target
Select Race, Element, or Blessing, then pick a name like Aesir, Fire, or Odin. Set how many rolls you plan to spend to see “at least one hit” odds.
Step 5. Check estimate labels
Exact rates show for S-tier races with listed roll chances. Other targets use rarity-pool estimates — look for the estimate note under results before committing rerolls.
Quick check: 10 Element Rerolls
Farm tab → target Element Reroll, quantity 10, kill duration 30s → Velik at ~84.75% should show ~12 kills and roughly 10–15 minutes with a 45s respawn cycle.
How it works
Boss farm planner
Expected kills ≈ quantity ÷ drop rate (midpoint of any rate range). Each farm cycle = your kill duration + boss respawn. Total time ≈ expected kills × cycle length. Efficiency ranking favors higher drop rates and shorter respawns — Nivaron, Velik, and Gelaros top the reroll goals in the wiki.
Farm formula
ExpectedKills = ceil(Quantity ÷ DropRate) CycleSeconds = KillDuration + RespawnSeconds EstimatedTime = ExpectedKills × CycleSeconds DropsPerHour = (3600 ÷ CycleSeconds) × DropRate
Reroll odds
When a race lists an exact roll chance (e.g. Aesir 0.0317%), expected rolls ≈ 1 ÷ p. For blessings and most non-S races, the tool divides rarity pool weight by how many entries share that rarity. Elements normalize all six roll weights into one pool because wiki weights sum above 100%.
Reroll formula
ExpectedRolls ≈ 1 ÷ HitProbability AtLeastOneInN = 1 − (1 − p)^N Estimate (no individual rate) = RarityPool% ÷ CountAtRarity
Provisional values from the bosses and drop tables on this site — not official game formulas. Rates may change after patches.
FAQ
Where do the drop rates come from?
Boss drop rates match the bosses wiki table. Sky Spire Holy Grail and Soul Ore bands use floor-tier estimates — marked as ranges in results. Respawn timers come from the same data. Patches can change rates without notice.
How is expected kill count calculated?
Expected kills ≈ target quantity ÷ drop rate midpoint. Total time adds your kill duration plus boss respawn per cycle.
Why are some reroll odds marked as estimates?
Aesir, Elf, and other S-tier races list exact roll chances. Lower-tier races and all blessings use rarity pool weight ÷ entries at that rarity when no individual rate exists.
Why do element odds use normalized weights?
Element roll weights in the wiki sum above 100%, so the calculator normalizes all six weights to a single pool before computing hit chance.