Crosspathing/Druid

In Bloons TD 6, it is important to choose the best crosspathing for a specific tower in order to receive the best benefits out of that tower type. Towers have special roles to play for each stage of the game. The Druid in its core is to provide special utility to the defense.

Introduction
At its base, the Druid is a 0-3-1 dart monkey but is much cheaper and pops one bloon per thorn. Druids in general are a very beginner-friendly tower. However, by itself, it cannot detect camo bloons cheaply without support (Superstorm can detect camo, but it's extremely expensive). Like its description states, "Creates a blast of thorns for each attack. Upgrades can call forth powers of the Jungle, Storm, or Wrath". Druid has upgrade paths that have a specific theme to them. Path 1 is about powers of the storm (Utility). Path 2 is powers of the jungle (Support). Path 3 is powers of Wrath (DPS). Crosspathing adds attacks to the Druid (except middle path).

Tier 2 and below



 * 0-0-0: Can be started on the first round as a source of cheap but effective popping power against sparse groups of Reds and strong early-game bloons.
 * 1-0-0: Adding extra pierce via Hard Thorns improves potential against groups of bloons and increases reliability against all bloons types.
 * 0-1-0: More thorns are thrown per throw (Increased to 8, from 5.)
 * 0-0-1: A basic range upgrade.
 * 1-1-0: More thorns have more pierce.
 * 1-0-1: The pierce increased thorns have more range.
 * 0-1-1: More thorns have more range.
 * 2-0-0: Adds a lightning attack that allows the Druid to pop lead bloons.
 * 0-2-0: It causes any attack from the druid to degrow bloons.
 * 0-0-2: It gains an automatic 10% increase in attack speed. This attack buff is permanent and will not increase nor decrease when lives are lost or gained respectively. However, the 1% attack speed buff aspect of this upgrade is a little complicated. The Druids gain 1% percent for each life that is lost. The attack buff maxes out at 100%. This includes the permanent 10% increase in attack speed and percent increase is additive. It does not matter when you bought this upgrade or what difficulty you bought this upgrade on. 1 Life lost = 1% percent increase in attack speed.
 * 2-1-0: The same thing as 2-2-0 but the Druid cannot degrow bloons
 * 2-2-0: This crosspath synergizes well with the lighting as it allows the Druid to degrow a lot more bloons than a druid without lightning could do.
 * 1-2-0: Usually a stepping stone for 2-2-0
 * 0-2-1: It can degrow from farther away
 * 1-0-2: The attack speed buff can also have more pierce.
 * 2-0-2: Its lightning is affected by the attack speed buff, so going for this crosspath is not bad. However, going for a Path 3, Tier 3 or more is not recommended, since it's lighting attacks are not affected by buff related to pierce or damage.
 * 0-1-2: A stepping stone for 0-1-3
 * 0-2-2: Usually not necessary as the more effective crosspath is 2-2-0 for reason that have been already explained.

Druid of the Storm



 * 3-0-0: Throws out gusts of wind in the shape of a tornado that blows back bloons hit by it away from the track and removes ice and glue from them.
 * 3-1-0: TBA
 * 3-2-0: Prevents regrow farming from bloons being sent out of range from the druid and also degrows a lot of bloons
 * 3-0-1: TBA
 * 3-0-2: TBA

Ball Lightning



 * 4-0-0: TBA
 * 4-1-0: TBA
 * 4-2-0: TBA
 * 4-0-1: TBA
 * 4-0-2: TBA

Superstorm



 * 5-0-0: TBA
 * 5-1-0: TBA
 * 5-2-0: TBA
 * 5-0-1: TBA
 * 5-0-2: TBA

Druid of the Jungle



 * 0-3-0: This tower summons vines to squeeze 1 bloon at a time until they pop. The vines always target the strongest bloon on screen (not including MOABs). Only the 1-3-0 crosspath directly affects the vines; otherwise treat crosspathing variety as if 0-2-0 or when going for further upgrades.
 * 1-3-0: Allows the Druid's after-vines to pop Leads, in addition to the thorns popping Lead too.
 * 2-3-0: Helps deal with grouped bloons that pass by the vines.
 * 0-3-1: The range of the vine attack as map-wide anyway so only the main thorn attack benefits from this.
 * 0-3-2: The attack speed buff only affects the main thorn attack.

Jungle's Bounty



 * 0-4-0: Jungle's Bounty gains more range and allows the Druid to reward money every time the ability is activated, and gives even more if surrounded by Farms. The only statistic that truly matters for Jungle's Bounty's money-generation portion is range, and as such 0-4-1 is the only truly worthwhile crosspath for that specific benefit. Start with 0-4-0 to charge the ability as soon as possible, and then crosspath.
 * 1-4-0: Same principles as 1-3-0
 * 2-4-0: Same principles as 2-3-0
 * 0-4-1: More range means it can have the potential to cover more Farms. For income-purposes, this is the superior crosspath.
 * 0-4-2: Same principles as 0-3-2

Spirit of the Forest



 * 0-5-0: Spirit of the Forest's main draw is its ground vines that deal contact damage to bloons passing by. It also gains +1 damage for all its attacks. Its ability also gains +25 lives too. Crosspathing is useful but not very important.
 * 1-5-0: Allows its on-track vines to pop Leads and DDTs. This is important when not going for MIB.
 * 2-5-0: Allows normal leads to become popped by its more powerful lightning. But since 1-5-0 already shreds Leads and affects DDTs, 2-5-0 is somewhat redundant unless this was from a Druid with this upgrade prior to upgrading.
 * 0-5-1: Gives a slight head-start to the growth of vines. Also useful for the Jungle's Bounty benefit.
 * 0-5-2: Same principles as 0-3-2

Druid of Wrath



 * 0-0-3: Gains more attack speed as it deals more damage without stopping damage after 2.0s. Crosspathing is very helpful for maximizing its power by assisting its attack speed. As for 0-0-3 itself, crosspaths aren't too necessary when pairing with Total Transformation, as its transformed form is affected by its own buff anyway.
 * 1-0-3: Thorns gain more pierce. For the same price as 0-1-3, it has slightly better grouped damage but worse single-target damage. As a small bonus, these thorns pop Lead.
 * 2-0-3: Superior as an option against grouped bloons, as lightning greatly assists in making it attack faster. Benefits well with Alch buffs.
 * 0-1-3: Superior as an option against single-targets, 8 thorns instead of 5 makes it attack faster. Not so effective against grouped bloons even with Alch buff.
 * 0-2-3: Degrowth shouldn't be relied on, although this specific upgrade can work if the Regrows are spaced bloons.

Poplust



 * 0-0-4: Like Shinobi Tactics, Poplust increases attack speed and pierce of nearby Druids, but it doesn't affect itself. Stack count is lowered but buff values are increased. Treat Poplust's crosspathing options as if it was a Druid of Wrath, except the fact that it is a Tier 4.
 * 1-0-4: Assuming this is with a Poplust army, the +25% attack speed and +25% pierce isn't as impactful to a 1-0-4 compared to a 0-1-4, with only a fair bit more grouped damage and a not-so optimized attack speed. As a small bonus, these thorns pop Lead.
 * 2-0-4: Assuming this is with a Poplust army, lightning synergizes very well with Poplust buffs due to the percentage increase of both attack speed buffs and pierce buffs.
 * 0-1-4: Assuming this is with a Poplust army, better single-target damage and the pierce buff provided makes it slightly better at grouped bloons.
 * 0-2-4: Degrowth shouldn't be relied on, although this specific upgrade can work if the Regrows are spaced bloons. Since Druid thorn pierce is normally quite low anyway, Poplust buffs simply won't address grouped Regrows for Poplust armies. The pierce buff is too insignificant for the thorns and increased attack speed doesn't quite do enough to make up for the low pierce.

Avatar of Wrath



 * 0-0-5: Gains increased damage based on how much RBE is on the screen for any given moment. Crosspathing should be focused on its main attack as its special damage-ramping power is unaffected by crosspaths.
 * 1-0-5: The extra pierce is going to be very nice for the Avatar of Wrath, but what really makes this crosspath stand out is giving thorns with lead-popping, which means a Radar Scanner would only be required if going for this crosspath which is much cheaper than MIB. However, Avatar of Wrath in general would prefer the other crosspath for additional thorns, and the loss of bonus pierce can be offset with pierce buffs such as Poplust and Obyn.
 * 2-0-5: Lightning damage increases at half the rate compared to the thorns, at +1 damage per 9000 RBE instead of +1 damage per 4500 RBE, and this damage caps at +15 instead of +30. More effective against grouped bloons at the exchange of less effective single-target power.
 * 0-1-5: The preferred upgrade as this means that more thorns is going to have increased damage when more RBE is on the screen.
 * 0-2-5: Heart of Oak doesn't do anything in terms of increasing the DPS of its main attack. In addition, Avatar of Wrath has very low pierce and therefore its degrowth portion will do very little assistance.