Automate applying effects to attacker on hit

[BramTeurlings]

When an attacker hits a target with an attack, it would be great to be able to configure custom triggers such as healing the attacker, damaging the attacker or applying a certain buff to the attacker.

Here's a short list of effects that I think may be useful to be able to configure:

• Healing
• Damaging
• Applying persistent damage if possible
• Etc

Below, I've detailed some features I'd like to see added in order of expected simplicity to implement:

Simple version:

• Apply static effects to attacker on hit
  • Configurable damage/healing which is subtracted/added from the attacker on hit
  • Optionally, a message notifying the health change

Advanced version:

• Apply dynamic effects to attacker based on the target Example: The enemy has the "Fire Shield" spell active on them, the attacker should then take damage when striking that enemy.
• Some way to configure what effects will trigger when being struck. Preferably from the character sheet, perhaps with a special buff?