Thunder Rat
Unique · Rat · Pet
Damage- 1–25
Cooldown- 2.5s
Accuracy- 75%
Start of 
:
- Discharge requires 1 less
per different 
On hit:
- Gain 3
- Inflict
on 1 item for 1 second - This and
gains +2 max
Discharge (11):
- Trigger an extra attack
On shop entered:
- Attract a Brown Rat
Level bonusLv 5–15 · unlocks at Lv 5, 10, 15
On hit:
- 30% → 90% chance this and gains +2 max
Levels also add: +4 · +15% 
· +15% 
· +10%
All 15 levels
- Lv 1Base item
- Lv 2Gain +1
- Lv 3Gain +5%
- Lv 4Gain +5%
- Lv 5On hit: 30% chance this and gains +2 max
- Lv 6Gain +5%
- Lv 7Gain +1
- Lv 8Gain +5%
- Lv 9Gain +5%
- Lv 10On hit: 60% chance this and gains +2 max
- Lv 11Gain +5%
- Lv 12Gain +2
- Lv 13Gain +5%
- Lv 14Gain +5%
- Lv 15On hit: 90% chance this and gains +2 max
Balance history
- v6.2.1mentioned in patch notes
- Thunder Rat: fixed star highlight condition
- : New Pattern
Start of
:- Discharge requires 2 → 1 less per different
On hit:
- Gain 0 → 3
- This and → gains +2 max
Discharge (16 → 11
)Level Bonus
On hit:- % chance this and → gains +1 → +2 max
- : 90 % → 75 %
- v2.2.0mentioned in patch notes
- Fix for Thunder Rat getting stuck in a state of never activating
On hit:
1 enemy item for 1 second
Discharge (15
):- This gains +3 max
- Trigger an extra attack
Discharge requires 2 less
per 
On shop entered:- Attract a Brown Rat
Level Bonus
On hit:- % chance this and gain +1 max
- v2.0mentioned in patch notes
- Items that have the Discharge mechanic: Elementium Ore, Fulmination Hammer, Thunder Rat, Thunderstrike Ring
Overload (48
): (was: 35)- This gains 50% faster attacks (was: one free attack per )
- This gains 50% faster attacks (was: one free attack per
- v0.38.1mentioned in patch notes
- Thunder Rat, I choose you!
Overload (25
→ 35 ):- (Remove) Stun 1 enemy item per Rat for 1.5 seconds
- (Add) Trigger 1 free attack per Rat
- (Remove) Stun 1 enemy item per
- v0.34mentioned in patch notes
- Thunder Rat tooltip updated with the correct overload stun duration
- On hit:
- This and Rats gain +2 → +1 max
- Stun a random enemy item for 0.02 → 0.03 seconds per
- Overload (25):
- No longer stuns ALL stunnable enemy items (but good job Thunder Rat, we’re proud of you)
- On hit:
- This and Rats gain +3 → 2 max
- Stun a random enemy item for 0.1 → 0.02 second per
- Overload (25):
- Stun 1 random enemy item per Rat for 2.5 → 1.5 seconds
- Level Bonus
- On hit: 20% chance to: This and Rats gain +10 → +5 max
- Damage: 1-14→1-25
- On Hit:
- Rats→This and Rats gain +1→3 max
- Added: Gain 1 per Rat (Rat Kings actually count for three now)
- Added: Stun a random enemy Item for 0.1 second per
- Removed: Every 2.5 seconds:
- Removed: Gain 1 per Rat (moved to On Hit)
- Removed: Rats are stunned for 1 second
- Overload (34→25 ):
- Removed: Rats gain +12 max and +50%
- Added: Stun 1 random enemy item per Rat for 2.5 seconds
- Added: On shop enter: Attract a Rat
- Level Bonus: On hit:
- 20% chance this and Rats gain +10% →+10 max
Added with Celeste’s release.
