Been seeing a bunch of Earthquakes being thrown around on much smaller kingdoms, so revisited Keeper's post when it got changed and there's definitely a problem with how it's designed. All of the backfire chance is limited to targets ABOVE you in KS - there's no protections for kingdoms lower than you. How does that make any sense? A kingdom 10 times your KS can EQ you multiple times a day and you have no recourse against them (and they gain protection from the EQs, which makes even less sense). Wouldn't it make sense to have the scaling backfire chance go both ways - scaling chance as you go up in KS, as well as scaling chance as you go down? If you have penalties in place for attacking someone lower than you, why wouldn't the same apply to offensive spells? Since we're tossing out changes on a whim when people have complained about large kingdoms, this one seems to be a no brainer to implement as well because it's something that's actually impacting many kingdoms at the moment.
Keeper's post:
Earthquake Spell: Backfire Chance Explained
The Earthquake spell is a powerful ability that can destroy up to 15% of a target kingdom’s basic buildings (excluding castles) when successful. However, if it fails, it may backfire, destroying 5% of the caster’s own buildings instead. The chance of a backfire depends on the Kingdom Strength (KS) ratio, calculated as the target’s KS divided by the caster’s KS (targetKS / casterKS). Below, we explain how this works in simple terms.
How Backfire Chance Works
The KS ratio determines how likely the spell is to backfire, making it riskier to cast Earthquake on kingdoms stronger than yours. Here’s how the backfire chance is set:
KS ratio ≤ 1.333 (target’s KS is up to 1.333x the caster’s):
0% backfire chance. Casting against kingdoms with similar or slightly higher KS is safe, with no risk of backfire.
KS ratio ≥ 2 (target’s KS is 2x or more the caster’s):
100% backfire chance. Casting against a much stronger kingdom will always backfire, damaging your own buildings.
KS ratio between 1.333 and 2:
The backfire chance scales linearly from 0% to 100%. For example:
A KS ratio of 1.5 (target’s KS is 1.5x caster’s) gives roughly a 25% backfire chance.
A KS ratio of 1.75 (target’s KS is 1.75x caster’s) gives roughly a 62.5% backfire chance