Fixed Sura Crescent Elbow (part of bugreport:5358), it now reflects properly.

git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@15760 54d463be-8e91-2dee-dedb-b68131a5f0ec

src/map/battle.c

@@ -3865,6 +3865,11 @@ int battle_calc_return_damage(struct block_list* bl, struct block_list *src, int
 					if (rdamage < 1) rdamage = 1;
 				}
 			}
+			if( sc && sc->data[SC_CRESCENTELBOW] && !(flag&BF_SKILL) && !is_boss(src) && rand()%100 < sc->data[SC_CRESCENTELBOW]->val2 )
+			{	// Stimated formula from test
+				rdamage += (int)((*dmg) + (*dmg) * status_get_hp(src) * 2.15 / 100000);
+				if( rdamage < 1 ) rdamage = 1;
+			}
 		}
 	} else {
 		if (sd && sd->long_weapon_damage_return) {