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{{Spell info}}

'''Fortress Blast''' is a level 6 [[Forgecraft]] spell which locks the user into place for a few turns, then creates a 5x5 explosion with damage based entirely on [[AC]]. It deals no damage to the user or their allies.

==Useful Info==
Prevents manual movement (and physical abilities like Hop) for <code>70 - 10*power/25</code> [[aut]],<ref>{{source ref|0.33.1|spl-damage.cc|5322}}</ref> after which a 5x5 explosion centered on the caster occurs. You are allowed to do other actions that don't rely on physical movement for the duration, including [[teleport]]/[[blink]]. If something displaces you during the channeling, e.g., an [[elephant]] [[trample]]s you, the fortress blast will dissipate harmlessly.

The explosion deals <code>6d(4 + 3*[AC^1.343]/17)</code> physical damage (max. 6d39 at 70 AC).<ref>{{source ref|0.33.1|spl-damage.cc|5368}}</ref><ref>{{source ref|0.33.1|zap-data.h|2626}}</ref> Notably, this means that the damage per AC ratio is non-linear, with each successive point of AC having a ''greater'' effect than the last.

You and your allies (even if not Forgecraft constructs) are not harmed by this spell.

==Strategy==
Not being able to retreat is quite dangerous in ''Crawl'', so this spell should not be used lightly - try to lure enemies into a known, cleared out area first. Doing this will also help mitigate this spell's loud noise.

This spell has a few notable synergies:
*Any source of AC will boost this spell's damage. [[Forge Phalanx Beetle]] and [[Ozocubu's Armour]] are easy ways to boost your AC before using this spell. [[Talisman]] forms can potentially help, especially [[Statue Form]].
**This spell is especially strong for [[species]] that gain extra AC as they level up, like [[Gargoyle]]s and [[Naga]]s. Species that can cast more easily in heavy armour, like [[Mountain Dwarves]] and enkindling [[Revenant]]s, may also reach Fortress Blast's higher damage thresholds.
*This spell does not have friendly fire, so it can synergize with other Forgecraft spells like [[Splinterfrost Shell]] to shield from melee attacks, and [[Awaken Armour]] due to its AC-reliant mechanics.

As a rule of thumb, you should strive to have at least 50 AC (possibly after being boosted by Forge Phalanx Beetle and/or Ozocubu's Armour) by 3-rune endgame for Fortress Blast to be effective.

==History==
*This spell was added in [[0.33]].

==References==
<references/>

Fortress Blast - Revision history

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