Wild Surge Table

When a Wild Mage casts a spell, there is a 5% chance the spell explodes in a wild surge. A d100 is rolled and the resulting effect is applied. Higher rolls are usually better than lower rolls.

Additionally, the Wild Mage's effective casting level fluctuates ±5 levels from his true level on every cast.

Table 4 — Wild Surge

Roll	Effect
01	Repulsion field centered on the caster
02	Wild color changes upon the caster
03	Squirrels appear around the caster
04	The caster becomes itchy
05	The caster glows
06	A Fireball centered on the caster
07	The caster's sex is changed
08	The caster's color changes
09	Everyone in the area changes direction
10	Explosion centered on the caster
11	Entangle spell centered on target
12	Slow spell centered on target
13	Target polymorphed into a wolf
14	Caster held
15	Caster hasted
16	Caster changed into a squirrel
17	80% of party gold destroyed
18	Target weakened
19	Sunfire spell centered on caster
20	Movement rate lowered on target
21	Fireball spell centered on caster
22	Caster held as per Hold Person spell
23	Fear spell centered on target
24	Roll twice more; both effects apply
25	Entire area explored
26	Globe of Invulnerability centered on target
27	Silence 15-Foot Radius centered on caster
28	Caster dizzy
29	Target invisible
30	Pretty sparkles! No other effect
31	Caster is spell's target
32	Caster becomes invisible
33	Color Spray from caster
34	Birds appear around the caster
35	Fireball centered on caster; no damage
36	Gems created on caster
37	Combat music starts
38	Goodberries created on caster
39	Fireball flies toward target
40	Charges drained in area effect around target
41	Random treasure created on caster
42	Caster is combat ready (+2 THAC0 and damage)
43	Teleport field centered on caster
44	Teleport field centered on target
45	Area effect hiccups centered on target
46	All doors opened in area of effect. If there are no doors, roll twice and use both effects
47	Caster polymorphed into a wolf
48	Change spell's target randomly
49	Caster recuperates as if rested
50	Monsters summoned near target
51	Start snowing if outside; if inside, roll twice and use both effects
52	Loud noise; target must save or be stunned
53	Target's hit points doubled
54	Summon demon to attack target
55	Spell fired but with squealing noise
56	Spell goes off but duration is halved
57	Strange visual effect; spell fizzles
58	Projectile speed halved
59	All weapons in the area glow
60	No saving throw allowed against the spell's normal effect
61	Target is held as per the Hold Person spell
62	Detect Magic spell centered on target
63	Roll four more times; use all effects
64	Slow spell centered on target
65	Instead of the chosen spell, a different random spell of the same level is cast
66	Lightning Bolt spell cast at target
67	Target strengthened
68	Heal spell centered on target
69	Entangle target
70	Caster weakened
71	Fireball spell centered on target
72	Flesh to Stone spell on target
73	Spell takes effect as normal, and caster is recuperated as if rested
74	Heal spell centered on caster
75	Target dizzy
76	Sunfire spell centered on target (caster unaffected)
77	Target held
78	Target blinded
79	Target charmed
80	Gems created on target
81	Target's movement rate doubled
82	Random treasure created on target
83	Target polymorphed into squirrel
84	Silence 15-Foot Radius centered on target
85	Target's sex changed
86	Fake explosion (no damage) centered on target
87	Cow falls from sky, lands on target
88	Target dizzy
89	Spell has 60-foot radius at target
90	Stinking Cloud centered on target
91	Target is itchy
92	Caster's hit points doubled
93	Target held
94	Target hastened
95	80% of gold on target is destroyed
96	Spell cast at double effectiveness
97	Spell cast, –4 to target's saving throw
98	Target's color changed
99	Spell cast at double level
100	Spell cast normally

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Source: bg2ee/original_manuals/baldurs_gate_2_ee_mastering_melee_and_magic.pdf — "Table 4: Wild Surge".