ReAcTiOnN's Combat Rules

A lightweight D&D 5e Foundry VTT module that enhances tactical combat with automated optional rules such as flanking, surrounded bonuses, high-ground modifiers, and condition-based advantage/disadvantage.
All features are fully toggleable through world settings so GMs can fine-tune combat to their table’s preferences.

When a melee attacker and an ally are positioned on opposite sides of a target, gain flanking bonus based on behaviour setting on melee attacks..

Choose how Flanking should work at your table:

• Advantage
• +1 to hit
• +2 to hit (default)
• +3 to hit
• +4 to hit
• +5 to hit

Optional rule:

• Flanking Requires Active Ally — The ally must not be prone, incapacitated, stunned, petrified, paralyzed, unconscious or dead.

GMs can mark individual creatures with flanking flags using simple hotbar macros:

• Flanking Immune — The creature cannot be flanked (e.g. Beholders, creatures with Blindsight, plants)
• Cannot Flank — The creature cannot provide flanking for allies (e.g. summons, minions)

Both flags are applied as Active Effects visible in the creature’s Effects tab. When flanking is blocked by a flag, the attack roll dialog displays a “No Flanking” note explaining why the bonus was not applied.

When all four cardinal spaces around a target are at least 50% blocked each by enemies or walls, attackers gain surrounded bonus based on behaviour setting on melee attacks.

Choose how Surrounded should work at your table:

• Advantage (default)
• +1 to hit
• +2 to hit
• +3 to hit
• +4 to hit
• +5 to hit

Ranged weapon and spell attacks gain Elevation bonus/penalty based on behaviour setting, when the attacker is at least 10 feet above/below the target’s elevation.

Choose how High Ground should work at your table:

• Advantage
• +1 to hit
• +2 to hit (default)
• +3 to hit
• +4 to hit
• +5 to hit

Choose how Low Ground should work at your table:

• Disadvantage
• -1 to hit
• -2 to hit (default)
• -3 to hit
• -4 to hit
• -5 to hit

Automatically applies advantage or disadvantage based on common status conditions, including:

• blinded
• restrained
• prone
• invisible
• poisoned
• paralyzed
• stunned
• unconscious

Tracks how much ammunition is used during combat then prompts the player to recover half used

• Option to recover magical ammo