Fissure

Open volcanic vents below your enemies, burning them to a crisp.

Fissure is the Druid's level 12 Elemental skill, requiring Molten Boulder; it unlocks Volcano. The table calls it "Eruption". It is a cast that opens a spread of cracks in the ground around the targeted point over the next few seconds, and each crack burns whatever stands on it. The numbers that decide it are the fire per crack, 217–227 at level 20, the 14 cracks the Basin counts per cast, and the cost, a flat 15 mana behind a 2-second casting delay.

The numbers

• Fire damage is the EMin/EMax columns with their brackets: 15–25 at level 1, then +6 a level on both ends to level 8, +12 to 16, +16 to 22, +18/+19 to 28 and +22/+23 past that (EMinLev1–5 and EMaxLev1–5). 81–91 at level 10, 141–151 at level 15, 217–227 at level 20, 401–419 at level 30. The Basin's level formulas give the same.
• Radius is calc1 = Param1 = 7, the table's "Radius to create Missiles"; the Basin describes the area as a 10-yard square centred on the targeted point.
• Spawn rate is calc2 = Param2 = 6, the table's "Missile Spawn Rate": a new crack every 6 frames by the Basin.
• Duration is a tooltip line that reads the missile table (miss('erruption center'.rang)) and is not in the repo's bank; the Basin's page gives it as 3.2 seconds (80 frames).
• Casting delay is localdelay 50 frames, 2 seconds, at every level, so it is not in the table. The Basin notes it is local in D2R where it was global in the older game.
• Mana is a flat 15.

The damage line reads lvl, so +skills from items raise it; the synergies read hard points only.

How it works

Fissure is a cast on your cast rate (Casting Speed) and cannot be used as a werewolf or werebear. The Basin's description: cracks open at random inside the square during the 80 frames after the cast, the first in the first frame and one every 6 frames after, 14 per cast; each crack stays open for 84 frames (3.36 seconds) and applies its fire damage to targets that stand or move over it. The damage is Fire Damage, cut by the target's Fire Resist and raised by Fire Skill Damage, see Dealing Elemental Damage; no attack rating is rolled and the Basin lists it as not blockable.

The Basin's rule on repeat hits: the cracks have Last Collide, so a crack normally damages a single target only once, and a lone monster must walk over several cracks to be hit several times. Two targets close enough to share a crack both take the full rate, since the last-collided target alternates between them.

The next delay sets the ceiling: the Basin says a target can be damaged only once every 6 frames, so the maximum fire per second is the damage × 25 ÷ 6, about 904–946 a second at level 20 before resistance, and only when the target keeps crossing fresh cracks.

Synergies and +skills

Two synergies at +12% fire damage per level (Param8 = 12, "Damage synergy"): Firestorm and Volcano, through EDmgSymPerCalc = (skill('Firestorm'.blvl) + skill('Volcano'.blvl)) × par8, hard points only. Fissure's own hard points are a synergy for Firestorm (+23% fire a point), Volcano and Armageddon; each of those pages gives its line. The Basin's page also lists Fissure as a synergy for Fire Claws in the older game, but the current Fire Claws row no longer reads it.

Against players

A player's hit on another player is cut to 17% of its value (difficultylevels.txt PlayerDamagePercentVSPlayer) before anything else, see Player versus Player. The Basin's page says nothing more about Fissure against players.

Build notes

• The damage is per crack and a crack hits a target once: against a single monster the skill's value is how many cracks it crosses, against a pack it is 14 cracks over 3.2 seconds for 15 mana.
• Forty hard points in Firestorm and Volcano are +480% on every crack; the synergies outgrow the skill's own levels, which +skills can supply.
• Two seconds of delay and 3.2 seconds of cracks means one field is always burning if you cast on cooldown.
• Its hard points feed Firestorm, Volcano and Armageddon at the same time.