Blood Boil

Erupt your demon's blood to damage nearby enemies.

Blood Boil is a Warlock attack cast through a demon (Demon Skills, level 18, requires Death Mark, unlocks Engorge). It needs a demon out (requirespettype 1, pettype demon) and deals two damage ranges in a radius around it, one physical and one fire, each identical at every level, while taking a share of the demon's life as its price. The numbers that decide it are the 194–258 physical plus 194–258 fire at level 20 and the 5% life floor the price settles at.

The numbers

• Mana is 3.75 at level 1 and rises 0.25 a level (mana 15, lvlmana 1, manashift 6) to 8.5 at level 20.
• Demon life cost is calc1, max(ln12, 5): Param1 (15) plus Param2 (−1) a level, floored at 5%, so 15% at level 1 and 5% from level 11 on. With two demons out the row uses calc2, max(ln12 ÷ 2, 5), and with three calc3, max(ln12 ÷ 3, 5): the share is split among them, never below 5 each.
• Radius is the tooltip's ladder: 5 yards, 6 from level 5, 7 from level 10. The row's own aurarangecalc steps 6, 9 and 12 at the same levels.
• Fire damage comes from EMin 10 / EMax 20 and their brackets: the minimum grows +8 a level to level 8, +10 to 16, +12 to 22, +16 to 28, +20 past that; the maximum +10, +12, +18, +26, +30 over the same brackets. Level 20 is 194–258.
• Physical damage comes from MinDam 10 / MaxDam 20 with the same five brackets, so the two ranges are the same number at every level: a level 20 cast is 194–258 physical and 194–258 fire.

The damage and cost lines read lvl, so +skills from items count; the synergies read blvl.

How it works

The eruption is centred on the demon and hits what is in the radius; there is no attack rating on the row, so it does not roll Chance to Hit. The physical half goes through Dealing Physical Damage and the fire half through Dealing Elemental Damage and the target's fire resistance. The row's calc4 (3) is its "Hit Delay". Blood Boil is also a skill your Summon Tainted casts on its own, at the level of your hard points in Blood Boil (sumsk3calc = skill('Blood Boil'.blvl)).

The price is the demon's life, not yours, and it is a percentage: at level 1 a cast costs the demon 15% of its life; from level 11 on it is 5% a cast with one demon, split with the floor of 5% each when two or three are out.

Synergies and +skills

Two synergy lines, both read from hard points (blvl) and both Param8 (20): Blood Oath, +20% Fire Damage per Level (EDmgSymPerCalc) and Engorge, +20% Damage per Level (DmgSymPerCalc, the physical range). Blood Boil in turn feeds Summon Tainted: its hard points add fire damage per level to the Tainted's Fire Ball and set the level of the Blood Boil the Tainted casts.

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; both ranges are cut the same way. The table has no other player-specific value.

Build notes

• Two ranges, two synergies: Blood Oath hard points multiply the fire half, Engorge hard points the physical half, each +20% a point, so 20 in both is +400% on each half.
• The life cost reaches its 5% floor at level 11 and never rises again; with +skills a few hard points reach it.
• The last radius step is level 10 (7 yards); nothing past that widens it.