Improve entity effect API

paper-api/src/main/java/org/bukkit/entity/Entity.java

@@ -1159,4 +1159,17 @@ public interface Entity extends Metadatable, CommandSender, Nameable, Persistent
      */
     @NotNull String getScoreboardEntryName();
     // Paper end - entity scoreboard name
+
+    // Paper start - broadcast hurt animation
+    /**
+     * Broadcasts a hurt animation. This fakes incoming damage towards the target entity.
+     * <p>
+     * The target players cannot include {@code this} player. For self-damage, use
+     * {@link Player#sendHurtAnimation(float)}.
+     *
+     * @param players the players to broadcast to (cannot include {@code this}
+     * @throws IllegalArgumentException if {@code this} is contained in {@code players}
+     */
+    void broadcastHurtAnimation(@NotNull java.util.Collection<Player> players);
+    // Paper end - broadcast hurt animation
 }

paper-api/src/main/java/org/bukkit/entity/Player.java

@@ -3899,4 +3899,16 @@ public interface Player extends HumanEntity, Conversable, OfflinePlayer, PluginM
     @Override
     Spigot spigot();
     // Spigot end
+
+    // Paper start - entity effect API
+    /**
+     * Plays an entity effect to this player for the target entity
+     * <p>
+     * If the effect is not applicable to this class of entity, it will not play.
+     *
+     * @param effect the entity effect
+     * @param target the target entity
+     */
+    void sendEntityEffect(org.bukkit.@NotNull EntityEffect effect, @NotNull Entity target);
+    // Paper end - entity effect API
 }