Onan's Streak

Onan's Streak is challenge #29. Start as Judas with and  and a damage bonus of +2 giving him a starting damage of 8.71. Missing any shots causes Judas to take damage. Treasure rooms are present in this challenge. The goal is to defeat Isaac.

Difficulty
Not hitting anything with tears causes Judas to take damage. This makes accuracy very important as missing a few shots can deplete his health very quickly. Because of this, fast-moving enemies or enemies with erratic movement patterns can prove to be very difficult in this challenge.

Strategy

 * Hitting any type of poop, fire, bomb, eternal fly, white champion enemy, spike block, or Stone Grimace (stone heads) does not count as a miss.
 * Hitting Red Poop with a spectral tear counts as a miss.
 * If firing a tear and leaving the room before it touches the wall or floor, Judas will not take any damage. This is only useful if he shoots accidentally.
 * For enemies that move erratically, try and get close enough so they'll close in. Once they approach, move out of the way and shoot them once they stop.

Good Items
Poop is not considered an enemy if it is the first object hit.
 * removes the need to fire tears at enemies in normal rooms, allowing Judas to destroy crowds of enemies just by walking by them.
 * removes the effect of Judas getting damaged when missing shots.
 * can help Judas to bypass most of the rooms without the need to fire tears.
 * Obtaining and charging your tears, but never firing, allows you to fire tears without fear of self-damage
 * nullifies 1 hit of damage per room, allowing more room for error.
 * Taking and never releasing the fire keys, even across floors, allows Judas to engage enemies without firing any tears.
 * has the same effect.
 * Taking is recommended, as hitting a wall won't deal damage to him, and hitting the ground won't either if an enemy is hit first.
 * Enemies include stone grimaces, unkillable enemies, fireplaces, poop, and bombs.
 * allows Judas' shots to miss without dealing damage as long as they don't hit a wall or object.
 * do not count as a hit/miss, and it maintains Chocolate Milk's charged damage bonus when activated, making it a safe combat alternative.
 * Shots fired by the familiar with will not damage the player. When coupled with a recharging or zero cooldown item such as, it will effectively give Judas a safe auto-attack. The Incubus's safe-to-miss shot will fire when the item is used, without having to fire Judas' shot.
 * benefits from this challenge, since the player will be focused on not missing. This can allow for long streaks at high damage.
 * keeps tears in a straight line in front, which is very helpful for hitting many later enemies.
 * 's explosion radius make it much easier to hit enemies, though like in any under situation with the item, caution should be exercised.
 * Spectral tears effect might help, since going through a rock doesn't count as missing.
 * can be powerful, as only the initial tear needs to hit an enemy; the burst tears do not count, unlike for other scatter shot items.
 * is helpful, since it gives Judas' tears a bigger hitbox, in addition to spectral tears. Flat Worm also gives a bigger hitbox.
 * Similarly, gives tears a bigger hitbox and allows Judas to hit many enemies with each tear. Any Polyphemus tear that continues after hitting an enemy won't damage Judas if it lands untouched afterward.
 * will help, giving spectral tears and allowing tears to go through the walls to get back on the other side.
 * Piercing shots could be useful since the shots won't damage if at least one enemy is hit, and multiple can be hit with one shot.
 * is especially useful because it increases the size of tears significantly, making it harder to miss, in addition to piercing and higher damage.
 * does not damage Judas as long as he hits at least one enemy, making the item very useful.
 * ,, and  won't damage Judas for missing enemies.
 * will keep spawning friendly spiders until there's 5 of them when charging the shot.
 * The same goes for the Guppy transformation or.
 * Be careful, however, as there is the possibility of friendly spiders/flies killing a target before Judas' fired tear connects.
 * The same goes for and, as spawning bombs under Judas while charging and the explosions from the brain, respectively, can easily end the run.
 * One well-timed charge of the could be enough to insta-kill It Lives and seriously damage Isaac.
 * Tears that have passed through an familiar do not deal damage to Judas even if all the split tears miss.
 * If you find, do not leave behind bomb-giving items such as . Placing bombs and pushing them towards the enemy with a fart is a viable alternative for shooting tears.
 * works about the same way.
 * Neither nor the shields from, , , , or similar items protect Judas from missed tears.
 * Watch out when using unidentified pills, as R U a Wizard? can be disastrous to the run if not extremely careful and/or lucky. Check the shops for a, just in case.
 * makes the challenge much easier in and beyond, as it halves the damage dealt from missing tears.
 * Any item that helps refill red heart containers such as the, , and will be helpful in case misses are frequent.
 * Items that grant homing tears, such as and, can make accuracy a lot easier. Although  is a bad item for this challenge (see below).
 * A very good strategy is to combine many different followers such as, or Isaac's head, and only using the tears from the followers as Judas' main source of damage. This is complimented by items such as  as Judas does not have to fire tears to deal damage with these followers.
 * Because of this, is a very useful item.
 * will not cause damage if it misses, making it an effective alternative to tears given Judas' high damage.
 * is an extremely valuable item since the tear never lands, thus Judas can't be hurt if it misses.
 * 's quad shot does not count as hits/misses, and taking damage, including damage from a missed shot, summons the more effective active familiar.
 * can be used to dodge damage from missed shots if timed correctly. Its teleport can also be used as damage so you don't have to risk missing shots.

Bad Items

 * Taking or  is not recommended, as they release tears which all count towards hit/miss. Since they release multiple tears at a time, they will almost unavoidably cause tears to hit the ground.
 * , however, don't.
 * The doesn't count either.
 * Unless Judas already has piercing tears, should generally be avoided. While blocking a shot does count as a hit, without piercing, it will also destroy the tear before it can do any damage, making bullet-heavy fights such as Mom's Heart/It Lives and Isaac extraordinarily difficult.
 * Taking any item that multiplies the number of tears (e.g., , , or is not recommended, as Judas has to hit with every tear to not take damage.
 * Similarly, taking, , , is not recommended, as the split tears also have to hit enemies for the player to not take damage.
 * Be careful when picking up any active Book items, as picking up 3 will transform Judas into a Bookworm, periodically giving him 2 shots.
 * Having effectively nullifies this problem.
 * can be dangerous, as even if the aura kills an enemy, if the shot doesn't hit an enemy or poop, it will count as a miss.
 * When using, keep some distance against non-boss enemies. If the ring kills an enemy before the tear hits it, it can cause Judas to miss the shot.
 * Judas can take damage from tears reflected by the ring.
 * should be avoided. The Explosivo shot doesn't count as hitting the enemy until it blows up. If Judas kills an enemy with the Explosivo shot on them, the tear will fall to the ground and will damage him. Enemies that jump or teleport will also cause Explosivo shots to fall off.  If the enemy with an Explosivo shot walks near a wall, the tear will disappear and will cause damage.
 * is not recommended, as it prevents charging shots (instead, firing automatically like regular tears). Judas does get a +1 damage increase after the damage reduction but the fast fire rate will make it nearly impossible to stop tears hitting anything other than an enemy.
 * similarly prevents charging shots and adds an unpredictable worm effect
 * Taking is not recommended, as firing two tears simultaneously will almost certainly cause one tear to miss.
 * Taking is not recommended, as firing a tear from a long distance causes the tear to reverse back the opposite direction and miss unless there is an enemy behind Judas.
 * Hitting a target while having still damages and teleports out of the room.
 * Charging shots before entering a room can kill, since it will fire a big tear followed by 3 little tears, causing damage.
 * ,, and Rainbow Worm are not recommended because the changing effects will make it more likely for tears to miss.
 * Using may take away, making the run significantly more difficult.
 * However, if using Clicker results in becoming Lilith, the challenge becomes much easier (see Incubus under Good Items).
 * The instant kill effect of doesn't count as a hit, and will hurt Judas.
 * will cause Judas to take damage on every shot.
 * will cause Judas to take damage on every tear's skip unless the tear hits an enemy before the next bounce.
 * will balance stats, making Judas' damage much less effective and thus necessitating more shots.
 * is not recommended, as tears from each familiar count as needing to land or else Judas will take damage.
 * will harm Judas if it fails to connect, so it is not recommended unless used for combat.
 * will harm Judas for each full shot fired.

Trivia

 * The challenge's name, "Onan's Streak," and the challenge conditions are a reference to the biblical character Onan. According to Old Testament law, a man with a married, deceased brother would have the responsibility of producing an heir for his sibling. Onan knew that having this heir would prevent him from legally owning his brother's land, and so spilled his semen onto the ground. God viewed this deed as wicked and killed Onan.
 * Despite the challenge forcing the player to play Judas, the challenge is only unlocked when beating Mom.
 * This challenge was the Twitch streamer CobaltStreak's idea, however he wanted the challenge to start with only 1 heart, and without Chocolate Milk. https://clips.twitch.tv/BoringSuaveIcecreamPupper-oKUtBa2pVCdOA1Lr