The Earthsplitter ordnance is a offensive artillery platform available to Arcturus Mengsk in Co-op Missions upon reaching Level 3. It has considerable range, which can be enhanced by upgrades at the engineering bay. Earthsplitters will fire randomly in the selected target area of a bombardment.
While the Earthsplitter ordnance itself costs no supply, by itself the platform fires at a rate of once every 30 seconds. This can be lowered by garrisoning Dominion troopers and Dominion laborers inside it, the the following firing rates:
15 (with 1 garrisoned unit)
10 (with 2 garrisoned units)
7.5 (with 3 garrisoned units)
6 (with 4 garrisoned units)
As such, it is important to have at least 3 or 4 units within each Earthsplitter to ensure a steady rate of fire. Alone these platforms do not do much, but in larger numbers they can continually shell an area for massive damage, aided by the random nature of their bombardments. Sufficient Earthsplitters can level incoming attack waves as they approach.
In addition, Earthsplitters can be salvaged for their full cost. This means that on maps where objectives may end up out of range, these platforms can be "leapfrogged" forward to an area where they can fire ob the objective. The attack so the Earthsplitter can be targeted through the fog of war, and briefly give vision of the area targeted.
The additional use of the Earthsplitter is for use with the Contaminated Strike calldown. Unlike the normal Bombardment, this calldown has unlimited range, but uses all Earthsplitters deployed. After around 6 Earthsplitters however, the Contaminated Strike zones begins to overlap for no additional effect.
Loads all your Earthsplitter Ordnance with an experimental payload to target any location on the map. Payloads randomly land near the target location, saturating the area in Irradiated Biomaterial and causing all enemies who enter to take 5 damage per second for 10 seconds. Affected units cannot Cloak.
Psychoactive Payload: Contaminated Strike now cast Fear on enemy units on impact, causing them to run around in panic for 5 seconds.
Toxic Tyrant: Reduces the Contaminated Strike cost by 20% and its cooldown by 66%. Increases the Fear effect duration by 200%. Irradiate effect additionally increases damage received by 25% and deals 6.25 damage per second.
25 20 (with Toxic Tyrant) 5
5 (Irradiate cloud) 5 (Fear effect, up to 15 with Toxic Tyrant) 10 (Irradiate effect)
30 10 (with Toxic Tyrant)
Contaminated Strike deals summary 50 damage and stacks up to three (summary 150) +25 damage when the enemy units are in the Irradiate cloud (62.5 damage per stack (summary 187.5) +31.25 damage when the enemy units are in the Irradiate cloud with Toxic Tyrant). Mastery: +0.05 (+0.0625 with Toxic Tyrant) damage per second per Terrible Damage mastery point. Up to a maximum 6.5 damage per second, deals summary 65 damage per stack (195 for three stacks) +32.5 damage when the enemy units are in the Irradiate cloud (8.125 damage per second, deals summary 81.25 damage per stack (243.75 for three stacks) +40.625 damage when the enemy units are in the Irradiate cloud with Toxic Tyrant)