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Equipment / Demolitions

Demolitions

Source Tech Revolution pg. 68
You can use Engineering to arm explosive charges (page 69) that you can trigger later with a detonator (Core Rulebook 218). Applying an explosive charge to a surface typically takes 1 minute, plus 1 minute to program its detonator; this is the primary charge. You can also apply up to five secondary charges to the surface; this takes an additional minute per charge, and each secondary charge must be the same type and mark as the primary charge. After you set the charges, the GM rolls your Engineering check in secret, so you’re not sure how effective your explosive charges are. You gain a circumstance bonus to your Engineering check based on your primary explosive charge’s mark, and the bonus increases by 2 for each secondary charge applied to the surface. The total result can’t exceed the primary charge’s Maximum Result (see Table 2–17: Explosive Charges on this page). The Engineering check DC to disable this explosive is equal to the result of this Engineering check minus the bonuses from secondary charges.
When you activate the detonator, the charges explode; this functions as a Strength check to break the structure (Core Rulebook 409) that uses your Engineering check’s result in place of the Strength roll. If the check is successful, the explosion breaks apart the structure, allowing movement through its space and preventing it from being closed again (such as for a door). On a success, the explosion also causes collateral damage, dealing fire and piercing damage equal to twice the explosive charge’s mark to all creatures and objects adjacent to the structure (Reflex for half) and filling the damaged area with dust and smoke that grants concealment for 1 round. For every 5 by which the Engineering check exceeds the break DC, the damaging explosion’s radius increases by 5 feet (to a maximum of 5 additional feet × the charge’s mark) and its damage increases by an amount equal to the explosive charge’s mark. The total collateral damage can’t exceed the structure’s break DC.
If you fail the check by 10 or more, the explosion doesn’t harm the structure. If you fail the check by 9 or less, the explosion deals 3d6 bludgeoning damage plus an additional 1d6 damage for every 2 item levels of the primary explosive charge (rounded up) to the structure; if the demolitions included secondary charges, each one increases the damage by 1d6 (or 2d6 if the secondary charges’ item levels are 10 or higher). If you fail the check by 4 or less, this damage also ignores half the structure’s hardness.
Controlled Explosion: When applying explosive charges, you can take a –4 penalty to your Engineering check to limit the subsequent damage, allowing for precise explosions. Choose a number. If your Engineering check result when setting explosive charges exceeds this number, the result is instead reduced to this number.
Embedded Charges: Through a combination of careful calculation and drilling holes in the surface to accommodate charges, you can maximize an explosion’s destructive potential. This process takes 10 minutes per charge, 5 minutes per charge of which requires the use of a laser torch (Starfinder Armory 105). As you finish setting the charges, attempt an Engineering check (DC = 10 + 1-1/2 × the primary charge’s item level). If you succeed and all charges used in an explosion are embedded in this way, apply a +2 circumstance bonus to the demolition’s Engineering check; the explosive charges’ maximum result increases by 5.
Quick Demolitions: You can halve the time it takes to apply explosive charges, but doing so applies a –5 penalty to your Engineering check to determine the explosion’s result.
Special: Abilities and effects that allow you to increase the rate at which you arm explosives also apply to the demolitions task. If you have an ability that reduces the time required for a specific action (such as the demolition expert envoy expertise talent, Armory 145), you can take that action to arm a single charge.