Event Bonus Chest

Baseline Bonus Chest Contents (increased by reward multiplier)

Tier	Chapter	Legendary Heroes (63%)				Event Rune (37%)
		41.7%	15%	6%	0.3%
I (1x)	1	10	30	70	110	5000 (15%) 7500 (13.9%) 10000 (8%) 15000 (0.1%)
	2	20	40	80	160
	3	30	70	110	210
II (2X)	1	20	60	140	220
	2	40	80	160	320
	3	60	140	220	420
III (3.5x)	1	35	105	245	385
	2	70	140	280	560
	3	105	245	385	735
IV (4.5x)	1	45	135	315	495
	2	90	180	360	720
	3	135	315	495	945
V (7x)	1	70	210	490	770
	2	140	280	560	1120
	3	210	490	770	1470

Required Event Rune spent and reward multiplier per bonus chest

Bonus chest	Runes for Chest	Total	Reward Multiplier
1	11250	11250	1x
2	15000	26250	1.2x
3	18750	45000	1.4x
4	22500	67500	1.6x
5	26250	93750	1.8x
6	30000	123750	2x
7	33750	157500	2.2x
8	37500	195000	2.4x
9	41250	236250	2.6x
10	45000	281250	2.8x
11	48750	330000	3x
12	52500	382500	3.2x
13	56250	438750	3.4x
14	60000	498750	3.6x
15	63750	562500	3.8x
16	67500	630000	4x
17	71250	701250	4.2x
18	75000	776250	4.4x
19	78750	855000	4.6x
20	82500	937500	4.8x
x	11250+(3750(x-1))	11250x+3750(x(x-1)/2)	1+0.2x