Efficacy Support

Efficacy Support is support gem that grants more spell damage, more damage over time, and increased skill effect duration.

Skill functions and interactions

The 3 modifiers Supported Skills deal #% more Spell Damage, Supported Skills deal #% more Damage over Time and Supported Skills have #% increased Skill Effect Duration are independent from each other so that 1 skill may benefit from only 1 modifier, but another skill may benefits from all 3 modifiers.

• Supported Skills have #% increased Skill Effect Duration This stack additively with and multiply with 's mod.

• Supported Skills deal #% more Spell Damage This mod multiplicative with other more damage multiplier. Since the stat_id behind this mod is support_efficacy_spell_damage_+%_final, while the other more damage, for example from , is support_reduced_duration_damage_+%_final. Read Stat#Interaction for details.

Gem level progression

Level			More Spell Damage	More Damage over Time	Incr. Duration	Exp.	Total Exp.
1	8	52	10%	15%	10%	0	0
2	34	57	11%	15%	10%	285815	285815
3	36	60	11%	16%	10%	252595	538410
4	38	63	12%	16%	11%	314394	852804
5	40	66	12%	17%	11%	388734	1241538
6	42	69	13%	17%	11%	477437	1718975
7	44	72	13%	18%	12%	583786	2302761
8	46	75	14%	18%	12%	710359	3013120
9	48	78	14%	19%	12%	1355511	4368631
10	50	81	15%	19%	13%	1138877	5507508
11	52	84	15%	20%	13%	1368233	6875741
12	54	87	16%	20%	13%	1638338	8514079
13	56	90	16%	21%	14%	1956648	10470727
14	58	93	17%	21%	14%	3655184	14125911
15	60	96	17%	22%	14%	3017327	17143238
16	62	99	18%	22%	15%	7720126	24863364
17	64	102	18%	23%	15%	15058455	39921819
18	66	105	19%	23%	15%	25964218	65886037
19	68	108	19%	24%	16%	62460771	128346808
20	70	111	20%	24%	16%	211508743	339855551
21	72	114	20%	25%	16%	N/A	N/A
22	74	N/A	21%	25%	17%	N/A	N/A
23	76	N/A	21%	26%	17%	N/A	N/A
24	78	N/A	22%	26%	17%	N/A	N/A
25	80	N/A	22%	27%	18%	N/A	N/A
26	82	N/A	23%	27%	18%	N/A	N/A
27	84	N/A	23%	28%	18%	N/A	N/A
28	86	N/A	24%	28%	19%	N/A	N/A
29	88	N/A	24%	29%	19%	N/A	N/A
30	90	N/A	25%	29%	19%	N/A	N/A
31	91	N/A	25%	29%	19%	N/A	N/A
32	92	N/A	25%	30%	20%	N/A	N/A
33	93	N/A	25%	30%	20%	N/A	N/A
34	94	N/A	26%	30%	20%	N/A	N/A
35	95	N/A	26%	30%	20%	N/A	N/A
36	96	N/A	26%	31%	20%	N/A	N/A
37	97	N/A	26%	31%	20%	N/A	N/A
38	98	N/A	27%	31%	21%	N/A	N/A
39	99	N/A	27%	31%	21%	N/A	N/A
40	100	N/A	27%	32%	21%	N/A	N/A

Related modifiers

The following modifiers are related to Efficacy Support:

Related unique items

The following unique items are related to Efficacy Support:

Version history

Version	Changes
3.15.0	Now has a 140% Cost and Reservation Multiplier (previously 130%). No longer has “Supported Skills deal 10-20% more Spell Damage”. Supported Skills now have 15-24% increased Duration (previously 10-16%).
3.13.0	Now requires level 8 at gem level 1 (from 31). Now causes supported skills to deal 10% more damage over time at gem level 1 (from 15%), up to 24% at gem level 20 (no change). Efficacy Support is now offered to the Witch for completing The Caged Brute, and can be purchased from Nessa by the Templar, Shadow and Scion.
3.12.0	Now has alternative gem quality.
3.0.2	Efficacy Support now correctly supports Damage over Time effects.
3.0.0	Introduced to the game.