Talk:Dr. Fetus

Bomb Synergy
Dr Fetus being affected by bomb modifiers isn't new in rebirth. In the original, they were affected by bobby bomb, bob's curse, and mr mega. All of which are bomb modifiers. --75.69.69.87 08:43, 9 November 2014 (UTC)
 * Please sign your posts. Furthermore, this current version of the page doesn't seem to mention WotL. --Zamie (talk) 00:27, 17 December 2015 (UTC)

Tiny Planet synergy
Bombs fly uncrontrollably around Isaac - very dangerous.
 * Please sign your posts. Furthermore, I've added this to the page now. For future reference, I've also confirmed that this particular synergy was present in Rebirth. --Zamie (talk) 00:32, 17 December 2015 (UTC)

Remote Detonator synergy
You can use the Remote Detonator to explode Dr. Fetus bombs early, which helps against moving enemies. Could someone add that in? --Anon
 * I'll add it right now, thanks --GryphusR (talk) 20:26, 3 January 2015 (UTC)

Ouija Board synergy
Ouija Board, instead of doing nothing (since it grants spectral tears you'd think it would do nothing for the bombs) works instead on the bombs. The bombs become spectral bombs. My mind has been blown by these spectral bombs. I couldn't find anything on this site about that. Maybe add it? --136.176.41.58 06:38, 19 January 2015 (UTC)
 * I've added it. Furthermore, I've confirmed that this synergy exists in Rebirth. --Zamie (talk) 00:40, 17 December 2015 (UTC)

Afterbirth Fruit Cake synergy
Keeps random effects from Fruit Cake, but tears turn into bombs which apply the random effect on explosion. Some effects are apparently discarded in favor of bomb-specific effects, such as Prize Bomb for explosive shot. Tear Rate remains constant.
 * Please sign your posts. Furthermore, I've added this to the main page. --Zamie (talk) 00:44, 17 December 2015 (UTC)

Afterbirth Monstro's Lung synergy
Tears from Monstro's Lung are replaced with bombs.
 * Please sign your posts. This is added to the main page now. --Zamie (talk) 00:45, 17 December 2015 (UTC)

Cricket's body, Holy Light! & Explosivo
As of Afterbirth DLC, I believe the combination of Dr. Fetus + Cricket's Body splits the bombs into 4 smaller bombs. Seed R8PZ F3Y8, Lazarus, Dr. Fetus at Cave I. This seed is from a save without all items unlocked though. The wiki states only the fire rate changes, but that is before the DLC. Holy Light is found later, but seems to have no effect. Bombs doesn't change appearance & no light beam hits the enemy. Explosivo is also found in The Hush treasure room and also seems to have no effect. Bombs doesn't stick to enemies, I can't tell if the damage changed though.
 * I can confirm this (but don't have a seed) - Butt Bombs + Dr. Fetus + Cricket's Body = instant death for most monsters. Can make it impossible to get past Brownie, though.--78.73.227.211 14:08, 11 December 2015 (UTC)
 * OP, please sign your posts. I have added this to the main page now. Furthermore, I've confirmed that the Cricket's Body synergy only exists in Afterbirth. --Zamie (talk) 00:50, 17 December 2015 (UTC)

Technology and Guppy + Dr. Fetus
So I just finished a Maggy run, and I noted a few things that happened in it that conflicts with the wiki:
 * First item was technology (1) and I kept the laser after getting Dr. Fetus
 * Transformed into guppy, and with the laser + Dr. Fetus shot blue flies did spawn.

Hello; please sign your posts. --Zamie (talk) 00:55, 17 December 2015 (UTC)
 * The new Technology synergy has been added to the page now.
 * I just tested Dr. Fetus with Guppy on the latest PC build of the game using Cheat Engine and it most certainly does not spawn any flies.

Dr. Fetus damage formula
Using the spidermod item will display base damage Dr. Fetus as 47.5, or 475 through spidermod's display. Eve's Mascara bombs will deal 65 damage, or 650 through spidermod's display. Along with this, Soy milk + Dr. Fetus will deal 33.5 dmg, or 335 through spidermod's display. This can be easily verified by giving Isaac these items and testing them out, through methods such as xml editing or cheat engine. 3.5 is Isaac's base tear damage.
 * The Dr. Fetus buff in afterbirth caused many to believe that the item was simply changed to be the same as the original game. However,In WOTL Dr. Fetus multiplied your damage by 3 and then added 50. This is also not the case here, as 3.5 x 3 + 50 = 60.5, not 47.5.
 * However, it is still true that Dr. Fetus adds flat dmg to your tears. This is seen through the fact that soy milk is not a 80% damage down here (47.5/5 does not equal 33.5), nor is mascara a 100% damage up (47.5 x 2 does not equal 65).
 * Even if you change the flat damage from 50 to some other number, the numbers do not add up. For example, 47.5 - (3.5 x 3) = 37. 37 flat damage, but this is above the damage of soy milk already. So therefore, not only has the flat damage up changed, but so has the tear multiplier.
 * A formula of 30 + (tear damage x 5), however, does work (which I guessed from the soy milk damage number, where you have a 3.5 + 30, making me deduce tear damage x 5 x 0.2 = 3.5 for the tear multiplier which is x5 to cancel soy's /5, and +30 for the rest of the dmg). (3.5 x 5) + 30 = 47.5, matching base damage fetus. )3.5 x 5 x 2) + 30 = 65, matching Eve's Mascara's multiplier on tear damage and the final result. (3.5 x 5 x 0.2) + 30 = 33.5 damage, having the soy and fetus multipliers cancel out for 3.5 and + 30 dmg. This should be the correct formula, except for special synergies such as Polyphemus + Dr. Fetus.
 * Something to note, is that x5 dmg + 30 is basically x3 +50 switched. It is possible that this is simply an error.

-AeveanLeeow (talk) 20:31, 17 December 2015 (UTC)

Added page addition recommendation
I just figure the page should mention that host hat makes you immune to your bombs.

Ipecac + Dr. Fetus + Cricket's Body
I had ipecac dr. fetus and I picked up Cricket's Body. When your bombs multiply with Cricket's Body, you will NOT be immune to the resulting 4 bombs! Please add this to the page. I can't because you locked it. 189.54.130.119 17:35, 7 February 2016 (UTC)

Butt Bombs Synergy
Got Dr. Fetus and Butt Bombs in the same run in Repentance. From testing, it seems to be 1 in 5 bombs will be a Butt Bomb. Possibly tied to luck stat? Unsure if this exists in prior versions. --ComradeBirv

Tractor Beam Interaction
I am unaware if this is new to repentance but either way its not listed in the interaction list. With tractor beam, Dr. Fetus bombs will follow the beam, but at a speed like homing bombs rather than snapping to the line as normal tears would. I'd say its one of the not reccommended type deals due to it making aiming, dodging, and not blowing yourself up much more difficult, but it should probably be listed either way. -mrfacefur1 (talk) 11:11, 2 May 2021