Buff

**Buff** là những hiệu ứng bị động được dùng để tăng sức mạnh cho vũ khí, thay đổi cơ chế hoạt động của vũ khí hoặc của kĩ năng nhân vật.

## Tổng quan

### Ô chứa buff (Slot Buff):

* Có 2 loại ô chứa buff: Ô trống (dấu cộng) và ô cấm (dấu trừ). Trong khi ô trống cho phép bạn khả năng chứa buff ở các ô đó, thì ô cấm lại ngược lại, không cho phép bạn chứa buff ở những ô đó.

* Mỗi nhân vật sẽ luôn có sẵn 6 ô buff, với ô thứ 6 là buff đi kèm của nhân vật đó khi bạn nâng cấp tối đa. Nếu bạn chưa nâng cấp nhân vật đó tới cấp tối đa, ô buff thứ 6 sẽ hiển thị là 1 ô cấm.
* Nếu bạn có nhiều hơn 6 ô buff, bạn sẽ có thêm lượt chọn buff vào các màn không cố định.

### Buff bổ sung (Additional Buff):

Đây là các buff có thể nhận trực tiếp mà không cần phải qua màn. Hiện có 2 cách để kiếm buff bổ sung:

1. Sử dụng bong bóng buff  Những bong bóng này sẽ chứa một buff ngẫu nhiên bên trong chúng. Bạn có thể mua chúng từ Mysterious Trader bằng máu hoặc nhận từ Turret Shop miễn phí trong The Origin.
2. Sử dụng một vài loại cây khi chúng đã lớn sẽ nhận được buff. Cụ thể:
	* Dragon Fruit Tree (Cây Thanh Long): Khiên Lửa
	* Mandrake (Nhân Sâm): Khiên Độc
	* Caterpillar Fungus (Đông Trùng Hạ Thảo): Tăng Máu
	* Cactus (Xương Rồng): Kháng Bẫy
	* Watermelon (Dưa Hấu): Buff Kéo Cung
	* Binary Tree (Cây Nhị Phân): Buff Shotgun
	* Magic Flower: Hồi Năng Lượng
	* Guardian Flower: Khiên Xanh
	* Crystal Mushroom: Tăng Gem
	* Radar Flower: Buff Laser
	* Mirror Flower: Buff Đạn Nảy
	* Fantastic Flower: 1 buff ngẫu nhiên bạn chưa sở hữu.

## Thông tin thêm

* Trong quá khứ, buff Energy từng là "Improve energy orb effectiveness"(Tăng độ hiệu quả của những quả cầu năng lượng) (tăng lượng năng lượng nhận được từ những cầu năng lượng này từ 8 lên 12). Sau đó, nó được cập nhật lên phiên bản hiện nay, cho 2 năng lượng mỗi khi giết kẻ địch.
* The "Get more gems at the end of each game" used to give 10 gems per floor.
* The "Increased accuracy and critical hit chance" buff used to be just "Decrease bullet spread".
* Prior to Update 1.4.1, the "50% off in shop" buff used to be 40%.
	+ And after version 1.9.0, this buff is glitched that the effect is only 25% off.
* Before Update 1.4.1, the "Release a radial blast when shield is down" buff did not destroy bullets.
	+ Then before 2.1.0, it would only trigger when the player took more damage than remaining armor.
* During version 1.6.5 to 1.7.x, it was the Reflect buff which increased damage of Laser Swords.
* In version 1.8.2, the texture of some buff's icons got updated.
* During version 1.8.2 to 1.8.3, the Increase 4 health buff could not heal the player by 4.
	+ This has always been the case for Multiplayer, though.
	+ It was partly corrected before 1.9.0, such that if the player restarts the floor right after getting this buff, the healing will not happen.
	+ And during version 1.9.0, if the player got this buff through Caterpillar Fungus, the game would start without that 4 healing.
* The side effect of Trap buff has gone two changes:
	+ Before 1.6.5, it would let the attacker take damage as soon as they hit the player.
		- This included damage on Paladin or Werewolf who can reduce damage with skills.
	+ During 1.6.5 to 1.7.10, it would fire 4-damage knives at 3 directions when the player took hit.
		- It was affected by Shotgun buff such that 5 knives were fired instead.
	+ After 1.8.2, it makes the player immune to contact damage, despite the description in English says "Immune to traps. Reflects some damage taken."
		- Switch to Chinese and the description becomes correct.
		- In Chinese, it says "免疫陷阱，免疫碰撞伤害" which can be translated into "Immune to traps, immune to collision damage." Though unmentioned, it prevents contact damage as well.
		- This confusion was cleared after version 1.9.7, as the buff was renamed to "Immune to traps, and immune to collision damage."
* Before version 1.9.7, the "Armor +1" buff used to be "Armor +1, immune to collision damage".
	+ Despite its old name, this buff did not grant you the immunity to collision damage.
* The Potion dropping buff description's was once misspelled as "Increase the **charge** of potion drop when breaking crates".
	+ If set to Chinese, the description does not say "increase chance" at all, rather it says "Breaking crates may cause potions to drop".
* During version 1.8.x, the Element buff could not affect laser guns (Ice Breaker alike).
	+ This still happens under "Weapon crit rate +100%, crit damage -50%" condition.
* Before version 1.9.0, players could only have up to 6 buffs (5 from runs and 1 from character bonus) each game.
	+ At that time, when playing with a character without bonus buff, the 6th slot would also display a plus sign.
* Before version 1.9.7, players with Poison or Fire buff could be briefly affected by enemy attacks that would cause debuffs, though they would be removed before ticking.
	+ There was a glitch where if the player was hit by a poisonous shot, the slow effect would last for the full duration, while the poison damage was removed correctly.
	+ Also, if the NPC Alchemist would cause poison, the effect would force a tick of damage even if player had the buff. Since version 1.9.7, nothing will happen if result is poison.