Do burst spells "bend" around corners? We play mainly on foundry and when you place a burst it won't spread up hallways the full length of burst area if you're not lined up with the hall. If you cast it at a corner it won't take a sharp angle around that 90 degrees. This, should be noted, is when our cleric was doing burst heals to players and damage to undead. I just wondered if this was a function of walls in a VTT stopping it and should it be spreading around corners or is it working as intended?
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Generally no, bursts do not bend or spread around corners.
They go directly outwards from the origin of the effect, but walls and such prevent the area from spreading in that direction and effects do not "bend" around corners.
There may be some specific spells/effects which specify that they do fill the entire area of their AoE, but if they exist they are the exception not the rule.
Just remember it will spread from the centre of the effect - not necessarily the caster.
Foundry is not handling Bursts properly (at least, the last time I checked) as it only shows the squares where there's no cover from walls.
So you have to include an extra square when there's a wall, but that's all.
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The spread area category that did bend around corners (that Fireball had in PF1) was dropped.
PF2 Burst needs Line of Effect from the origin point of the burst to the targets in the area in order to affect them, and if that line of effect is obstructed (but not completely blocked), the target may have Cover for any attack rolls or saves that the burst effect uses.