diff --git a/src/abilities/Headless.js b/src/abilities/Headless.ts
similarity index 97%
rename from src/abilities/Headless.js
rename to src/abilities/Headless.ts
index c81d1e8a1..c71a0efc8 100755
--- a/src/abilities/Headless.js
+++ b/src/abilities/Headless.ts
@@ -5,12 +5,13 @@ import * as arrayUtils from '../utility/arrayUtils';
 import { Creature } from '../creature';
 import { Effect } from '../effect';
 import { Direction } from '../utility/hex';
+import Game from '../game';
 
 /** Creates the abilities
  * @param {Object} G the game object
  * @return {void}
  */
-export default (G) => {
+export default (G: Game) => {
 	G.abilities[39] = [
 		/**
 		 * First Ability: Larva Infest
@@ -98,6 +99,7 @@ export default (G) => {
 					/* Headless position is the front hex of its two hexes, so we look for
 					an enemy unit two hexes back which will be the hex directly behind Headless. */
 					matrices.inlineback2hex,
+					false,
 				);
 			},
 		},
@@ -119,7 +121,7 @@ export default (G) => {
 
 				//At least one target
 				if (
-					!this.atLeastOneTarget(crea.getHexMap(matrices.frontnback2hex), {
+					!this.atLeastOneTarget(crea.getHexMap(matrices.frontnback2hex, false), {
 						team: this._targetTeam,
 					})
 				) {
@@ -135,12 +137,13 @@ export default (G) => {
 
 				G.grid.queryCreature({
 					fnOnConfirm: function () {
+						// eslint-disable-next-line
 						ability.animation(...arguments);
 					},
 					team: this._targetTeam,
 					id: crea.id,
 					flipped: crea.player.flipped,
-					hexes: crea.getHexMap(matrices.frontnback2hex),
+					hexes: crea.getHexMap(matrices.frontnback2hex, false),
 				});
 			},
 
@@ -246,6 +249,7 @@ export default (G) => {
 
 				G.grid.queryDirection({
 					fnOnConfirm: function () {
+						// eslint-disable-next-line
 						ability.animation(...arguments);
 					},
 					team: this._targetTeam,
@@ -372,13 +376,14 @@ export default (G) => {
 
 				G.grid.queryChoice({
 					fnOnConfirm: function () {
+						// eslint-disable-next-line
 						ability.animation(...arguments);
 					},
 					team: Team.Both,
 					requireCreature: 0,
 					id: crea.id,
 					flipped: crea.player.flipped,
-					choices: [crea.getHexMap(hexes), crea.getHexMap(hexes, true)],
+					choices: [crea.getHexMap(hexes, false), crea.getHexMap(hexes, true)],
 				});
 			},
 
@@ -404,6 +409,7 @@ export default (G) => {
 					damages, //Damage Type
 					[], //Effects
 					ability.getTargets(hexes), //Targets
+					false,
 				);
 			},
 		},
diff --git a/src/ability.ts b/src/ability.ts
index cba6a548b..8e903abee 100644
--- a/src/ability.ts
+++ b/src/ability.ts
@@ -41,7 +41,8 @@ export type Trigger =
 	| 'onStartOfRound'
 	| 'oncePerDamageChain'
 	| 'onCreatureMove onOtherCreatureMove'
-	| 'onCreatureSummon onDamage onHeal';
+	| 'onCreatureSummon onDamage onHeal'
+	| 'onStartPhase onEndPhase';
 
 // Could get rid of the union and optionals by creating a separate (or conditional) type for Dark Priest's Cost
 // This might narrow down the types in the constructor by checking `creature.name`
@@ -78,7 +79,7 @@ export class Ability {
 	upgraded: boolean;
 	title: string;
 
-	// TODO properly type all these unknowns
+	// TODO properly type all `unknown` types
 	// These properties come from extending a specific ability from `src/abilities`
 	requirements?: Requirement | undefined;
 	costs?: Cost | undefined;
@@ -89,11 +90,12 @@ export class Ability {
 	affectedByMatSickness?: boolean;
 	activate?: (target?: any, hex?: any, path?: Hex[]) => unknown;
 	getAnimationData?: (...args: unknown[]) => unknown;
-	damages?: CreatureMasteries & { pure?: number };
+	damages?: Partial<CreatureMasteries> & { pure?: number };
 	effects?: AbilityEffect[];
 	message?: string;
 	movementType?: () => 'flying'; // Currently, this functon only exists in `Scavenger.js`
 	triggeredThisChain?: boolean;
+	range?: { minimum?: number; regular: number; upgraded: number };
 
 	_lastBonus?: number;
 
@@ -108,6 +110,9 @@ export class Ability {
 	getAbilityName?: (name: string) => string;
 	getMovementBuff?: (buff: number) => number;
 	getOffenseBuff?: (buff: number) => number;
+	_getHexes?: () => any;
+	_getMaxDistance: () => number;
+	_directions?: Direction[];
 	_targetTeam: Team;
 
 	// Below methods exist in Snow-Bunny.ts
diff --git a/src/utility/hexgrid.ts b/src/utility/hexgrid.ts
index 3128c2a99..e222d066f 100644
--- a/src/utility/hexgrid.ts
+++ b/src/utility/hexgrid.ts
@@ -77,7 +77,7 @@ interface QueryOptions {
 	 */
 	arg: any;
 
-	optTest: () => boolean;
+	optTest: (arg: Creature) => boolean;
 
 	/**
 	 * Function applied when clicking on one of the available hexes.
@@ -579,6 +579,7 @@ export class HexGrid {
 			fillOnlyHoveredCreature: false,
 		};
 
+		// Overwrite any default options with options passed in through `o`
 		o = { ...defaultOpt, ...o };
 
 		let hexes = [];