Frost Wall

The Bandits drew closer and they were gaining confidence. The first few volleys of Fireballs had been more than enough to drive them away, killing several in the process. They retreated to the underbrush, where they regrouped and planned. Now they advanced again, shields up, safe in their great numbers. The Witch surveyed her opponents, wand resting lightly in hand, waiting for the right moment.

It came soon enough, for the Bandits raised their weapons aloft, and came on with a cry. Their blood lust overcame their caution, and the Witch made her move. She flicked her wand quickly, and at once a great wall of solid ice sprang up in the Bandit's path. They crashed into it full force, and before they could recover, three other towering walls rose around them, locking them in an icy prison. Smiling, the Witch conjured a roaring pillar of fire in the center of the freezing prison, and delighted in the shrieks of her trapped enemies roasting alive.

Description on the official Path of Exile website

Skill Functions and Interactions

Duration: Higher skill gem levels will improve base wall duration, which can be further modified by "skill duration" passives and supports.

Permeability: Players, monsters and most projectiles can not pass through a frost wall. There are some exceptions: teleporting and leaping skills, and projectiles that pierce can pass through a Frost Wall. Frost Walls are Impermeable to all other movement and projectiles, even if they are originated by the caster.

On hit effects: Projectiles that trigger an effect everytime they hit something, like lightning arrow, trigger their effects everytime they hit an ice wall segment as well. Pierce can be used to trigger the effects multiple times.

Invincible: Frost Walls cannot be destroyed by any amount of damage.

Charges: When frost wall is struck by Power Siphon It has a chance to generate a Power Charge. For this to occur, Power Siphon must hit the frost wall a few moments before the wall's duration expires. If timed correctly Power Siphon counts as dealing the killing blow, and generates a power charge, despite the fact that Frost Wall is invincible.

Gem level progression

Level			Mana Cost	Base duration	Base Duration	Length	Cold Damage	Exp.	Total Exp.
1	4	16	9	3.00 sec	3.00	N/A	8 to 12	0	0
2	6	20	10	3.10 sec	3.10	N/A	9 to 16	841	841
3	9	27	11	3.20 sec	3.20	N/A	14 to 23	3099	3940
4	12	33	12	3.30 sec	3.30	N/A	18 to 27	7433	11373
5	16	41	13	3.40 sec	3.40	N/A	25 to 37	22895	34268
6	20	50	15	3.50 sec	3.50	N/A	32 to 49	49725	83993
7	24	58	16	3.60 sec	3.60	N/A	42 to 63	95714	179707
8	28	67	18	3.70 sec	3.70	N/A	54 to 81	169595	349302
9	32	75	19	3.80 sec	3.80	N/A	68 to 102	283759	633061
10	36	83	21	3.90 sec	3.90	N/A	85 to 128	453996	1087057
11	40	92	22	4.00 sec	4.00	N/A	106 to 159	703128	1790185
12	44	100	23	4.10 sec	4.10	N/A	131 to 196	1061223	2851408
13	48	109	25	4.20 sec	4.20	N/A	160 to 240	2065870	4917278
14	52	117	26	4.30 sec	4.30	N/A	196 to 294	2507110	7424388
15	55	123	27	4.40 sec	4.40	N/A	227 to 341	2573731	9998119
16	58	130	29	4.50 sec	4.50	N/A	263 to 394	7611351	17609470
17	61	136	30	4.60 sec	4.60	N/A	303 to 455	13437908	31047378
18	64	142	31	4.70 sec	4.70	N/A	350 to 524	25052147	56099525
19	67	148	32	4.80 sec	4.80	N/A	402 to 603	43869436	99968961
20	70	155	33	4.90 sec	4.90	N/A	462 to 693	242081178	342050139
21	72	159	34	5.00 sec	5.00	N/A	506 to 759	N/A	N/A
22	74	N/A	34	5.10 sec	5.10	N/A	554 to 832	N/A	N/A
23	76	N/A	35	5.20 sec	5.20	N/A	607 to 910	N/A	N/A
24	78	N/A	36	5.30 sec	5.30	N/A	664 to 996	N/A	N/A
25	80	N/A	36	5.40 sec	5.40	N/A	726 to 1089	N/A	N/A
26	82	N/A	37	5.50 sec	5.50	N/A	794 to 1191	N/A	N/A
27	84	N/A	38	5.60 sec	5.60	N/A	867 to 1301	N/A	N/A
28	86	N/A	39	5.70 sec	5.70	N/A	947 to 1420	N/A	N/A
29	88	N/A	39	5.80 sec	5.80	N/A	1033 to 1550	N/A	N/A
30	90	N/A	40	5.90 sec	5.90	N/A	1127 to 1691	N/A	N/A
31	91	N/A	40	5.95 sec	5.95	N/A	1178 to 1766	N/A	N/A
32	92	N/A	41	6.00 sec	6.00	N/A	1230 to 1844	N/A	N/A
33	93	N/A	41	6.05 sec	6.05	N/A	1284 to 1926	N/A	N/A
34	94	N/A	42	6.10 sec	6.10	N/A	1340 to 2011	N/A	N/A
35	95	N/A	42	6.15 sec	6.15	N/A	1399 to 2099	N/A	N/A
36	96	N/A	42	6.20 sec	6.20	N/A	1461 to 2191	N/A	N/A
37	97	N/A	43	6.25 sec	6.25	N/A	1525 to 2287	N/A	N/A
38	98	N/A	43	6.30 sec	6.30	N/A	1591 to 2387	N/A	N/A
39	99	N/A	43	6.35 sec	6.35	N/A	1661 to 2491	N/A	N/A
40	100	N/A	44	6.40 sec	6.40	N/A	1733 to 2599	N/A	N/A

Version history

Version	Changes
2.0.2e	Frost Wall's cooldown can no longer be bypassed by expending Power Charges. Frost Wall's cooldown has been reduced from 5 seconds to 3 seconds.
2.0.0	Now has a cooldown that can be bypassed by consuming Power charges. Its damage, duration, and wall length have all been greatly modified.
0.10.0g	Fixed a bug where Frost Wall could push around immobile objects.
0.9.12	Frost Wall can't be used through walls anymore.
0.9.4	Fixed a bug where Frost Wall could damage non-hostile bandit leaders.
0.9.2	Fixed a crash with Frost Wall.
0.8.7	Frost Wall added to the game.