Unstable Core

Engineer skill · Overload Line · tier 5 (ultimate)

Beta 0.7.2

The core loses stability and the whole group speeds up with it.

It is only used in combat once it is placed on the hero's active bar, and its 16 s cooldown is before cooldown reduction.

Values by rank

Unstable Core scales with Haste. Its value at each rank is 660 + 188 × rank:

Rank	1	2	3	4	5	6	7	8	9	10
Value	848	1,036	1,224	1,412	1,600	1,788	1,976	2,164	2,352	2,540
Haste	+8.48%	+10.36%	+12.24%	+14.12%	+16%	+17.88%	+19.76%	+21.64%	+23.52%	+25.4%

Haste is a percentage stat, so the value is used as written (in basis points, shown here as a percentage), times the skill power.

Haste = value × skill power
skill power = 1 + 1% per point in the other Overload Line skills + 2% per rank of each skill that boosts it

How to unlock it

1
Rank 5 in Soul Siphon Tier 4 of the Overload Line.
2
Hero level 32 at the earliest There is no level requirement, but a hero gets one skill point every 2 levels.
3
One skill point per rankUp to rank 10.

Mastery and synergies

Line mastery: every point in the other Overload Line skills makes Unstable Core 1% stronger, up to +40% with all of them at rank 10. Its own points do the same for the rest of the line.

Unstable Core has no synergies: no skill boosts it and it boosts no other skill.

Overload Line

Skill	Tier	Type	Cooldown	Scales with
Thruster	1	Buff	14 s	Haste
Overdrive	2	Buff	14 s	Haste
Overburden	3	Buff	14 s	Haste
Soul Siphon	4	Sustain	None	Lifesteal
Unstable Core	5	Ultimate	16 s	Haste

Other Engineer skills

Source: closed-beta game client 0.7.2. Data from the closed beta, so values may change at launch.